Waterbrick Stackable Water & Food Storage 3.5 gallon Containers (4 Pack – BLUE) are perfect for your daily storage needs or in any emergency situation. Waterbricks are made from rugged High Density Polyethylene (HDPE) with an easy on and off screw-on lid (water-tight) and comfortable carrying handle. These unique water and storage containers will fit just about anywhere in your home . garage . boat . or vehicle. The inter-locking . cross-stackable design takes up a very small storage footprint in your home. Place them full of water in a closet . under a bed . or in the trunk of the car.