Like everyone with type 1 diabetes and almost half of the people with type 2, my wife uses insulin to control her diabetes. When we vacation, we always used to make sure that our room has a refrigerator or at least had ice that we could use to keep the insulin cold, but not freezing.
Just like there are two kinds of people, there are two kinds of pens. I think that both kinds of people are worth keeping, but that’s not true for pens.
Insulin pens are either prefilled and disposable or they are reusable. You throw away your prefilled pens when the insulin in it is finished. If you use a reusable pen, you just through away the insulin cartridge, but you better keep the pen.