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Person wearing a blue crossbody bag with a cooler in it standing against a gray background

About ZKSCOOL

A personal cooler. It goes everywhere you do.

We make personal coolers for refrigerated medication.

Three of them, in three sizes: CB01, CB02, CB04. Each one holds any temperature you set between 2 °C and 20 °C, runs on a battery, and fits in a bag.

Personal is literal. Not a travel accessory you dig out twice a year, and not an appliance that lives in one room. It is yours the way your phone is yours — on the desk on Tuesday, in the bag on Friday, in the car on Saturday, back on the desk on Monday. Same box, same setting, no handover.

Most days it never leaves the house. It is built so that the day it does, nothing about that is a project.

We manufacture them ourselves. If you have shopped this category, you may have already met our hardware under another name and at another price. We would rather you bought it from the people who build it, warranty it, and pick up the phone.

We are engineers who spent a long time making institutional cold-chain equipment hold a number, and then made something small enough for one person's day.

Precision temperature control

Set a temperature. It holds it. 2 °C to 20 °C, on an LCD readout, on battery, wall power or a car socket. CB04 adds USB, so it runs from a power bank.

Fits what you carry

CB01 takes up to 7 pens or 10 vials. CB02 is the same cooling in a larger chamber. CB04 is 42 mm deep inside, so small vials stand upright — about 12 insulin pens, or 7 of the larger biologic auto-injectors. For days that don't need electronics, the Thermal Cup holds up to 24 hours on an ice pack.

The warm end matters

Every other cooler in this category is built around getting cold. But a lot of labels say the opposite. Epinephrine auto-injectors: do not refrigerate. Gvoke rescue glucagon: do not refrigerate or freeze. Diagnostic eye drops sit at 8–27 °C — a floor that is warmer than the top of a fridge. The pen you are currently using is room temperature only. Cold is a setting. It isn't the product.

And everywhere after

Then, on the days it does leave, nothing changes. A trip is not a longer version of a normal day — it is the day your fridge disappears, your schedule moves, and the thing you cannot replace is in a bag on your shoulder. The same box handles it.

Power, wherever the trip puts you. Wall, car socket, swappable battery — and on CB04, USB, so a power bank in a seat-back socket keeps it running. Batteries swap in seconds, which is what turns a long-haul flight into a solved problem instead of a countdown.

It clears security. Medically necessary medication and the cooling items that protect it are exempt from TSA liquid limits. No product is TSA approved — TSA does not certify products — so anyone who tells you otherwise is selling you a sticker.

It has room for the buffer. The CDC advice is to pack twice as much medication as you think you will need; Diabetes UK says two to three times. That is only useful if you have somewhere to keep it, which is why capacity is a travel feature, not a luxury — and why none of it belongs in checked baggage, where holds run cold enough to freeze insulin and a delayed bag is a missed dose.

One customer flew 15 times across Australia, Fiji and New Zealand over two months — humid tropics to southern-hemisphere winter — and reported not a single out-of-range reading. Her previous cool packs lasted about four hours.