20 Packs Ice Pack Sheets for Shipping Frozen Food, Dry Coolers Cool Box Bags, Small Freezer Blocks Mailing Cold Perishables Chocolate Camping Picnic (8cm X 11cm)

【Magic Freezer Blocks】- They are ice papers first, but they will become freezer blocks after absorbing water, only need to soak into water for 5 minutes, it will absorb water automatically. 【Long Lasting Coldness】- Freeze the freezer blocks for 6 hours after absorbing water, the freezer blocks will stay cold for 6 hours at room temperature and 10 hours in insulated bag. 【Safe & Reusable】- Freezer blocks are made from non-toxic material, safe for daily use. 3 layer strong constructions make sure it can be reused for multiple times. 【Multipurpose】- The freezer blocks can be used for many purposes need added coldness: lunch box/bag, cooler, insulated bag/box, cool box, picnic, party, car travelling, hiking, etc. 【Leak Proof】- The latest technology products will not have mucus after water absorption and will not leak out.