Insulin is notoriously dramatic about temperature extremes. Leave it in a hot rental car in Spain, and you might as well throw it away. On the flip side, tucking it too close to an ice pack can freeze it solid, rendering it completely useless. Smart travelers rely on specialized cooling wallets or insulated compartments that maintain a stable, safe zone without requiring a bulky coole... https://kytbags.com/collections/shop/products/starterkyt