マッシュルーム温冷パック

The vinyl shell is tougher than I expected and the gel stays warm for the whole lunch hour. I like that I can also freeze it for iced drinks, it's really versatile for such a small price.

Wasn't expecting much for the price, but this little mushroom pack actually keeps my yogurt cold until lunch without leaking. The tough vinyl is a nice change from flimsy ice packs that crack.

I use this in my lunch box to keep soup warm, and the tough vinyl has held up perfectly after dozens of microwaves. The gel stays cold for hours when frozen too, which is a nice bonus.