Tough and durable 250D tarpaulin with insulation. All seams are sonically welded and waterproof. Built-in bladder pressure release valve to increase insulation or reduce size for easy packing. Built to fit 24 cans or 12 bottles with plenty of room for ice. Insulation will keep contents ice cold for 12+ hours. Includes heavy-duty padded chest straps with built-in bottle opener.