Rambler PRO

Insulin Pen Case with Real-Time Temperature Display & Built-In Battery

£160.99

Your Insulin Pen Deserves Better Than a Pouch and a Prayer. The New Rambler Pro Insulin Pen Case keeps your insulin at the exact temperature you set — verified on a live display, all day, in any weather.

  • ⚡ Electric Cooling — Precise heat protection (2–25°C)
  • ❄️ Also Refrigerates — Maintains fridge temperature (2–8°C) when needed
  • 🌡️ Real-Time Temperature Display — See exact internal temp at all times
  • 🔄 3-in-1 Cooling Modes — USB power, built-in battery, or Biogel Ice-Pack
  • ✅ Pocket-Sized — Fits 1 insulin pen, slips into any bag or pocket
  • ✈️ Hand Luggage Approved — Like all our coolers!
Free Delivery in the UK Free Delivery in the UK
Approved for Air Travel Approved for Air Travel
+ 300 000 Coolers Sold + 300 000 Coolers Sold
Insulin Storage

Compatible with Most Insulin Pens

The Rambler Pro is designed to carry up to 1 standard insulin pen or pre-filled syringe, including the most common brands prescribed in the U.K.:

  • NovoRapid, Lantus, Tresiba 100, Tresiba 200, Toujeo, Apidra, Humalog, Humalog Mix 50/50, Humalog Mix 75/25, Humalog 200, Basaglar, Levemir, Admelog, Semglee, Humulin I, Humulin M3, Humulin S, Insulatard, Actrapid, Trurapi, Insuman, ProtaPhane, Novomix 30, Novomix 50, Soliqua, Abasaglar.

ℹ️ In-Use Insulin (Room Temperature Protection)

Most open insulin pens in active use can be stored at room temperature below 26°C for 28–56 days, depending on the brand.
The Rambler Pro is the perfect all-day cooling case— its electric cooling system keeps your pen consistently below that threshold, even on the warmest days or in stuffy indoor environments.

ℹ️ Unopened / Refrigerated Insulin

The Rambler Pro can also maintain fridge temperatures (2–8°C) using the Electric USB-LID — useful for transporting a single unopened insulin pen that requires strict refrigeration.

For carrying multiple insulin pens or vials at fridge temperature, we recommend our range of mini fridges and refrigerated travel cases for insulin.

⚠️ Important Note
This list is not exhaustive. Insulin pen formats and sizes vary by brand. If your insulin isn't listed, contact us — we'll help you confirm compatibility.

Compatibility with Other Medications

Other Compatible Injectable Medications:

In addition to insulin, the Rambler Pro is compatible with a range of other injectable medications requiring temperature control and heat protection.

It carries up to 1 injection pen of the following medications:

  • Diabetes & GLP-1: Mounjaro (tirzepatide), Victoza (liraglutide)
  • Osteoporosis injections: Tymlos (abaloparatide), Terrosa (teriparatide), Movymia (teriparatide), Algoven (teriparatide)
  • Others: Benepali, Besremi, etc.

ℹ️ Important Note
This list is not exhaustive. Always verify your medication's dimensions and specific storage requirements with your pharmacist or GP. Contact us if your medication isn't listed or if you need help choosing your medical cooler.

Cooling Efficiency - Time & Temperature

Cooling Modes & Performance

The Rambler Pro Insulin Pen Case offers three cooling methods to keep your insulin pen cool — whether you have access to power or not.

⚡ Cooling Method 1: Electric USB-LID (Connected to External Power)

Connects to any standard USB power source — wall socket, car USB port, power bank, or laptop. The LED display activates and you set your desired internal temperature using the (+) and (−) buttons.

  • Primary use: Keeping your in-use insulin pen safe from heat, all day
  • Adjustable temperature range: 2–25°C
  • Operating ambient range: -20°C to 35°C
  • Duration: Unlimited — as long as power is connected

💡 Pro Tip: Plug in 15–30 minutes before inserting your insulin pen, so the cooler has already reached your target temperature.

3 Working Intensity Levels Depending on the Ambient Temperature:

  • 1st gear: keeps your insulin cool at 2–25°C when the ambient temperature is between -10°C and 20°C
  • 2nd gear: keeps your insulin cool at 2–25°C when the ambient temperature is between -15°C and 30°C
  • 3rd gear: keeps your insulin cool at 2–25°C when the ambient temperature is between -20°C and 35°C

Use a higher gear on warmer days for best performance!

🔋 Cooling Method 2: Electric USB-LID (Built-In 10,000 mAh Battery)

The included 10,000 mAh rechargeable battery slots into the Electric USB-LID for fully cordless electric cooling — no cables required.

  • Primary use: All-day cordless insulin protection
  • Temperature range: 2–25°C, adjustable
  • Operating ambient range: -20°C to 35°C

BATTERY DURATION: 4–30+ hours depending on working intensity and target temperature:

  • Room temperature protection (20–26°C) at 1st gear: 30+ hours
  • Fridge temperature (2–8°C) at higher gear: 4–8 hours

🧊 Cooling Method 3: Biogel Ice-Pack Only (No Electricity Needed)

For shorter outings, the included Biogel Ice-Pack provides simple, effective cooling without any power source.

  • Temperature maintained: Below 25°C
  • Duration: 10–16 hours under typical conditions
  • No electricity required

⚠️ The Biogel method keeps temperatures below 25°C — ideal for in-use insulin needing heat protection. For strict refrigeration at 2–8°C, use the Electric USB-LID method.

How to Use Your Cooler

How to Use Your Rambler Pro Insulin Pen Case

⚡ Method 1: USB-LID Connected to Power

  • Connect: Screw the Electric USB-LID into the Stainless Steel Thermos until firmly closed.
  • Power on: Plug the USB cable into the USB-PORT on the side of the Electric USB-LID and connect to your power source. The LED display will light up.
  • Set temperature: Use (+) and (−) to set the internal temperature to your insulin's safe storage range.
  • Pre-cool: Wait 15–30 minutes for the unit to reach your target temperature before inserting your insulin.
  • Load: Open the Electric USB-LID, insert your insulin pen into the aluminium tube, and re-screw onto the thermos.
  • Monitor: Check the real-time LED display at any time to confirm your insulin is at a safe temperature.

🔋 Method 2: USB-LID with Built-In Battery

  • Charge: Ensure the included 10,000 mAh battery is fully charged (solid non-blinking indicator = full).
  • Insert battery: Slide it into the battery chamber below the LED display on the Electric USB-LID.
  • Assemble: Screw the Electric USB-LID onto the Stainless Steel Thermos.
  • Power on: Press and hold the centre button until the LED display lights up.
  • Set temperature & intensity: Use (+) and (−) for temperature. Tap the centre button to select working intensity — use a higher gear in warmer conditions.
  • Load: Once the cooler reaches your target temperature, insert your insulin pen.

🧊 Method 3: Biogel Ice-Pack Only

  • Shake: Shake the Biogel before freezing so the gel spreads evenly.
  • Freeze: Lay flat in the freezer for at least 6 hours. Longer is fine and won't cause damage.
  • Activate: Submerge in lukewarm tap water for 30–60 seconds (no hot water). Alternatively, leave at room temperature for 10–15 minutes.
  • Dry & load: Pat dry, place in the stainless steel thermos with your insulin pen, and close the cooler with the stainless steel lid.
Dimensions & Technical Details

📏 Cooler Dimensions

  • Size: 3.0 cm × 6.86 cm × 23.5 cm
  • Material: 304 Stainless Steel, Vacuum Sealed

⚡ Electrical Specifications

  • Input Voltage: 5V / 2A
  • Input Power (USB Plug): AC 100–240V
  • Input Power: 10W
  • Output Voltage: 5V / 2A
  • Battery Capacity: 10,000 mAh (included)
  • Compatible Power Banks: Any 5V / 2A output (20,000 mAh recommended)

🌡️ Operating Temperature Conditions

  • Adjustable Temperature Range: 2–25°C
  • Max Ambient Temperature: 35°C
  • Min Ambient Temperature: -20°C
Included with your Cooler

What's included with Your Rambler PRO Insulin Pen Case:

  • 1 Stainless Steel Thermos — insulated body that holds your insulin pen and cooling element
  • 1 Carrying Bag — protective bag for daily carry
  • 1 Stainless Steel Lid — for use with the Biogel Ice-Pack cooling method
  • 1 Electric USB-LID — smart electric cooling lid with real-time LED display
  • 1 Biogel Ice-Pack — no-electricity cooling for up to 10–16 hours
  • 1 USB Power Plug & Cable — connects to any compatible USB power source
  • 10,000 mAh Battery — rechargeable battery for cordless electric cooling

🛡️ Also includes: 1-Year Warranty + Lifetime Customer Support!

Delivery

We offer free delivery in the UK.

Delivery Policy.

Rambler PRO insulin pen case cooler - 4AllFamily UK

Insulin Pen Case with Real-Time Temperature Display & Built-In Battery

£160.99

Because "Probably Fine" Isn't Good Enough for Your Insulin.

The Rambler Pro keeps your insulin at the exact temperature you set — verified on a live display, all day long.

The Insulin Pen Case That Actually Tells You Your Insulin Is Safe

Most insulin pen cases do one thing: slow down the inevitable. They buy you a few hours before the temperature creeps up, and then you're left hoping for the best.

The Rambler Pro works differently. It doesn't just slow the heat — it controls it.

Set your target temperature using the (+) and (−) buttons, and the electric cooling system locks it in. The real-time LED display shows you the exact internal temperature at any moment, so you're never left wondering. Your insulin is either safe, or you know about it immediately.

That's not a small upgrade. That's a completely different level of confidence.

Designed For British Weather — And Everywhere Else

The UK isn't exactly known for heatwaves. But insulin doesn't only spoil in the sun. A warm office, a stuffy commute on the Tube, a car left in a car park on a mild summer's afternoon — these are all enough to push temperatures above the safe threshold for your in-use insulin pen.

And then there's the other direction. A bitter January morning, a winter walk, a cold snap that catches you off guard — temperatures below 2°C can damage insulin just as badly as heat.

The Rambler Pro handles both. Its electric system actively cools when it's warm and heats when it's cold, maintaining the precise temperature you set whether it's 35°C in July or -20°C in the depths of winter.

One compact insulin pen case. Every British season — and every destination beyond.

Your In-Use Insulin Doesn't Need To Live In The Fridge

Here's something many insulin users don't realise: once your pen is open and in active use, it doesn't need to be refrigerated. Most in-use insulin pens can be kept safely at room temperature — below 25–26°C — for 28–56 days, depending on the brand.

The challenge isn't refrigeration. It's consistency. Keeping your pen reliably below that threshold throughout a full day, in all conditions, is where most ordinary insulin coolers fall short.

The Rambler Pro solves this precisely. Set it to your insulin's safe room temperature range, and it maintains that temperature all day long — actively, electrically, verifiably. Not approximately. Exactly.

And if you ever need to carry an unopened pen that requires refrigeration, the Rambler Pro can handle that too — the electric USB-LID cools down to full fridge temperature (2–8°C) when needed.

Need to carry 2+ pens or vials at fridge temperature? The Rambler Pro is a one-pen cooling case. For more capacity, explore our range of mini fridges for insulin.

⚠️ Important — Not The Right Insulin Cooler For Every Situation

The Rambler Pro is a compact, single-pen insulin pen case. It is purpose-built for the daily heat protection of 1 in-use insulin pen.

It is not the right choice if you need to:

Carry 2 or more insulin pens at room temperature → See the Chillers Cooling Pouches

Carry insulin at strict fridge temperature as your primary need → See our range of portable mini fridges for insulin

The Insulin Pen Case That Actually Tells You Your Insulin Is Safe

Most insulin pen cases do one thing: slow down the inevitable. They buy you a few hours before the temperature creeps up, and then you're left hoping for the best.

The Rambler Pro works differently. It doesn't just slow the heat — it controls it.

Set your target temperature using the (+) and (−) buttons, and the electric cooling system locks it in. The real-time LED display shows you the exact internal temperature at any moment, so you're never left wondering. Your insulin is either safe, or you know about it immediately.

That's not a small upgrade. That's a completely different level of confidence.

Designed For British Weather — And Everywhere Else

The UK isn't exactly known for heatwaves. But insulin doesn't only spoil in the sun. A warm office, a stuffy commute on the Tube, a car left in a car park on a mild summer's afternoon — these are all enough to push temperatures above the safe threshold for your in-use insulin pen.

And then there's the other direction. A bitter January morning, a winter walk, a cold snap that catches you off guard — temperatures below 2°C can damage insulin just as badly as heat.

The Rambler Pro handles both. Its electric system actively cools when it's warm and heats when it's cold, maintaining the precise temperature you set whether it's 35°C in July or -20°C in the depths of winter.

One compact insulin pen case. Every British season — and every destination beyond.

Your In-Use Insulin Doesn't Need To Live In The Fridge

Here's something many insulin users don't realise: once your pen is open and in active use, it doesn't need to be refrigerated. Most in-use insulin pens can be kept safely at room temperature — below 25–26°C — for 28–56 days, depending on the brand.

The challenge isn't refrigeration. It's consistency. Keeping your pen reliably below that threshold throughout a full day, in all conditions, is where most ordinary insulin coolers fall short.

The Rambler Pro solves this precisely. Set it to your insulin's safe room temperature range, and it maintains that temperature all day long — actively, electrically, verifiably. Not approximately. Exactly.

And if you ever need to carry an unopened pen that requires refrigeration, the Rambler Pro can handle that too — the electric USB-LID cools down to full fridge temperature (2–8°C) when needed.

Need to carry 2+ pens or vials at fridge temperature? The Rambler Pro is a one-pen cooling case. For more capacity, explore our range of mini fridges for insulin.

⚠️ Important — Not The Right Insulin Cooler For Every Situation

The Rambler Pro is a compact, single-pen insulin pen case. It is purpose-built for the daily heat protection of 1 in-use insulin pen.

It is not the right choice if you need to:

Carry 2 or more insulin pens at room temperature → See the Chillers Cooling Pouches

Carry insulin at strict fridge temperature as your primary need → See our range of portable mini fridges for insulin

Thirty Hours. One Battery. No Excuses.

The single biggest worry about any electric device is running out of power at the wrong moment.

The Rambler Pro's included 10,000 mAh battery eliminates that concern. Used at 1st gear for everyday room temperature protection, it runs for 30+ hours on a single charge — more than a full day and night without touching a plug socket. That covers a long day at work, a train journey up to Edinburgh, a weekend trip to the countryside, or an overnight stay away from home.

When you need to cool to fridge temperature at a higher gear, battery life is 4–8 hours. And if you ever need more, simply plug into any USB source — a wall socket, car port, power bank, or laptop — to switch to unlimited electric cooling with no interruption.

Three modes. One cooler. Your insulin stays protected regardless.

What Makes The Rambler Pro Different From Every Other Insulin Coolers

Walk into any pharmacy and you'll find passive insulin pen cases — neoprene pouches, insulated sleeves, gel packs. They all do the same thing: create a buffer between your insulin and the ambient temperature. They're better than nothing. They're not better than the Rambler Pro.

Here's what sets it apart:

Active vs. passive cooling. A standard case slows temperature change. The Rambler Pro prevents it. There's a fundamental difference between the two — one reacts, the other controls.

Verification. With a standard case, you have no idea what temperature your insulin is actually at. With the Rambler Pro's real-time LED display, you do. Always.

All-season capability. Standard cases offer no protection against freezing. The Rambler Pro's anti-freeze function ensures your insulin never drops below 2°C, whatever the weather.

Three power options. Plug-in USB for unlimited cooling. Built-in battery for up to 30+ hours cordless. Biogel Ice-Pack for 10–16 hours with no electricity at all. Whatever your day demands, the Rambler Pro adapts to it.

Hand Luggage Approved — From London To Anywhere

Flying with insulin can feel complicated. The Rambler Pro makes it simple.

The entire kit is approved for hand luggage. The 60ml Biogel Ice-Pack sits comfortably within the 100ml liquid allowance. The Electric USB-LID and 10,000 mAh battery meet airline carry-on requirements. Whether you're catching an early morning flight from Heathrow or a connecting flight halfway around the world, your insulin pen case travels with you — no special permissions, no checked baggage, no drama.

A few tips to keep things moving smoothly at airport security:

  • Keep your insulin pen inside the cooler at all times — it makes the medical purpose clear immediately
  • A frozen Biogel alongside your medication rarely raises any issues
  • Always pack the USB-LID and battery in your hand luggage, never in the hold

Thirty Hours. One Battery. No Excuses.

The single biggest worry about any electric device is running out of power at the wrong moment.

The Rambler Pro's included 10,000 mAh battery eliminates that concern. Used at 1st gear for everyday room temperature protection, it runs for 30+ hours on a single charge — more than a full day and night without touching a plug socket. That covers a long day at work, a train journey up to Edinburgh, a weekend trip to the countryside, or an overnight stay away from home.

When you need to cool to fridge temperature at a higher gear, battery life is 4–8 hours. And if you ever need more, simply plug into any USB source — a wall socket, car port, power bank, or laptop — to switch to unlimited electric cooling with no interruption.

Three modes. One cooler. Your insulin stays protected regardless.

What Makes The Rambler Pro Different From Every Other Insulin Coolers

Walk into any pharmacy and you'll find passive insulin pen cases — neoprene pouches, insulated sleeves, gel packs. They all do the same thing: create a buffer between your insulin and the ambient temperature. They're better than nothing. They're not better than the Rambler Pro.

Here's what sets it apart:

Active vs. passive cooling. A standard case slows temperature change. The Rambler Pro prevents it. There's a fundamental difference between the two — one reacts, the other controls.

Verification. With a standard case, you have no idea what temperature your insulin is actually at. With the Rambler Pro's real-time LED display, you do. Always.

All-season capability. Standard cases offer no protection against freezing. The Rambler Pro's anti-freeze function ensures your insulin never drops below 2°C, whatever the weather.

Three power options. Plug-in USB for unlimited cooling. Built-in battery for up to 30+ hours cordless. Biogel Ice-Pack for 10–16 hours with no electricity at all. Whatever your day demands, the Rambler Pro adapts to it.

Hand Luggage Approved — From London To Anywhere

Flying with insulin can feel complicated. The Rambler Pro makes it simple.

The entire kit is approved for hand luggage. The 60ml Biogel Ice-Pack sits comfortably within the 100ml liquid allowance. The Electric USB-LID and 10,000 mAh battery meet airline carry-on requirements. Whether you're catching an early morning flight from Heathrow or a connecting flight halfway around the world, your insulin pen case travels with you — no special permissions, no checked baggage, no drama.

A few tips to keep things moving smoothly at airport security:

  • Keep your insulin pen inside the cooler at all times — it makes the medical purpose clear immediately
  • A frozen Biogel alongside your medication rarely raises any issues
  • Always pack the USB-LID and battery in your hand luggage, never in the hold

Your New Insulin Pen Case. Built to Last. Backed by 4AllFamily UK.

Travelling with insulin and temperature-sensitive medicines has never been simpler or safer.

With our medical travel coolers, you’re now free to explore the world with peace of mind, knowing your medication is securely stored at the perfect temperature!

Frequently asked questions

Can 4AllFamily’s Medical Coolers be used for insulin?

Absolutely! Our medical travel case cooler were originally designed with insulin in mind, ensuring they’re perfectly suited for all your insulin storage needs.

For your in-use insulin pens and vials, it’s vital to keep them protected from heat and stored at room temperature below 26°C.

Unopened insulin, however, must be kept refrigerated at a temperature of 2-8°C.

While some of our coolers are designed to provide fridge-temperature storage, other offer room-temperature cooling.

We recommend checking the detailed cooling performance specifications for each cooler on their respective product pages.

Our insulin cooler cases are compatible with all types of insulin pens and vials sold in the UK, including Admelog, Afrezza, Apidra, Basaglar, Fiasp, Humalog, Humulin, Lantus, Levemir, Lyumjev, Novolin, Novolog, Novorapid, Ryzodeg, Toujeo, Tresiba, Velosulin, and Xultophy, among others.

Can 4AllFamily’s Medical Coolers be used for other diabetes injections?

Yes!ᅠOur medical travel coolers and portable fridges are suitable for any diabetes injection that needs to be kept cool or refrigerated while travelling.

This includes: Ozempic, Mounjaro, Trulicity, Victoza, Byetta, and others.

Can 4AllFamily's Travel Coolers be used for weight-loss injections?

Yes, our medical-grade travel cooling cases and portable fridges are great to carry weight-loss injections.

Most weight-loss injections prescribed in the UK are very sensitive to heat and must be transported cool or refrigerated.

This includes: Mounjaro, Wegovy, Saxenda, and others.

Can 4AllFamily’s Cooling Cases be used for Growth Hormones?

Absolutely! Most growth hormones are highly sensitive to temperature changes and must be kept either at fridge temperature or at least protected from heat.

If you’re travelling with growth hormones, you need a medical-grade cooler case to ensure your medication is safe and properly stored.

Our coolers have been thought with growth hormones injection devices in mind and would be totally suitable to carry all brands and types of growth hormones, including the most popular ones in the UK like Genotropin, Humatrope, Norditropin, Saizen, Omnitrope, Zomacton, NutropinAq, Somatrogon, Ngenla, and others.

Can 4AllFamily’s Cooling Cases be used for Rheumatoid Arthritis Injections?

Absolutely. Most injectable medications used to treat Rheumatoid Arthritis are temperature-sensitive and must be kept cool or refrigerated.

Our medical-grade travel coolers and portable fridges are perfect for protecting them and would fit many of your injectables, including Humira, Enbrel, Actemra, Orencia, Cimzia, and others.

Other Medications Compatible with 4AllFamily Travel Coolers:

4AllFamily’s medical travel coolers and mini fridges can be used for any medications that need to refrigerated or kept cool during transport, including:

  • Allergies (EpiPen) 
  • Migraines (Aimovig, Egmalty) 
  • Eyes drops 
  • Multi Sclerosis injections 
  • Testosterone Replacement Therapy  
  • Erectil Dysfunction (Trimix) 
  • Osteoroporosis (Prolia, Xgeva, Forteo)
  • Cholesterol (Repatha, Praluent) 
  • Vaccines 
  • Botox 
  • Excema (Dupixent) 

If your medicine is not on this list, do not hesitate to contact us and ask! In any case, always ask for your doctor’s advice.

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"The insulin is nice and cool despite it being really hot out today. Feeling really thankful today because finding these products has given us our active lifestyle back."
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"I usually have this cooler it's really big and awkward but I found this brand called 4allfamily. Its this little cooler pack, stick it right in the freezer. It's literally so small compared to a regular cooler"
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"This is wonderful. This is something easy, lightweight. I can fit this in here perfectly, and I can keep this in my bag while I'm doing errands"
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"My favorite way to keep insulin cool"

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Travelling with Medications

Get inspired by real-world travel tips from adventurers like you.

Elevate Your Cooler Game

Make your medical cooler case pop!

Add a touch of charm for practicality and personality.

Keep Insulin, Ozempic, Wegovy, Mounjaro, Epipen, and 30+ Medications Cool!

Keep all your medical injections cool with 4AllFamily's Travel Cooling Cases & Portable Mini Fridges