cooler shock reusable ice packs (set of 5) - long lasting cold freezer packs for coolers & lunch bags - compress for knee injuries, back pain relief, post-surgery accessories cooler shock five cooler shock high performance, reusable, fill and save lunch pack ice packs perfect for on the go. final filled weight is 1 pound which is about 2 to 3x the performance and size of typical ice packs. these cooler shock packs are designed to keep your lunch bag cold for up to 48 hours depending on use