【Initial Use Warning】 Avoid tipping over the internal powder when opening the lid. Fill water up to the maximum water level line, and tightly screw the lid (minor leakage is normal). Allow it to sit for thirty minutes without further leakage, then placing it in the freezer for freezing 【Thick & Powerful Cooling Core】Designed for heavy-duty use, these ice packs measure 3.3 x 1.0 x 5.5 inches and provide long-lasting cold retention for large cooler bags. Perfect for camping, road trips, tailgating, or outdoor cooking 【Reusable & Long-Lasting Performance】Built to endure extreme outdoor conditions, these reusable ice packs freeze solid and keep food or drinks cold for hours. Use them again and again without cracking or leaking 【Made for Large Coolers & Ice Bags】These ice packs fit seamlessly into full-size cooler bags, camping coolers, and ice chests. Stack multiple units for extended trips, fishing days, or off-grid excursions 【Easy to Clean & Safe Materials】Made from BPA-free, food-grade HDPE and filled with non-toxic gel, these packs are safe to use with packaged food and drinks. Wipe clean after use — no mess, no residue ASIN B0CS6FNR97 Size 5.5 x 3.3 x 1.0 （small） Color blue-4p Brand Name musbus Unit Count 4.0 Count Item Weight 0.12 Kilograms Manufacturer xy Chamber Depth 1 Inches Material Type Polyethylene (PE) Container Type Box Additional Features Portable Included Components cooler Insulation Material Type Resin Manufacturer Part Number 101 Recommended Uses For Product Camping, Picnic, Hiking, Fishing, Travel, Outdoor Cooking, Tailgating, Festival