WaterBricks are water storage contaniers that are small and portable, which means they can be stored easily, and are great on the go. They can stack up and are made of FDA approved, BPA free plastics, making them safe to store your water in. They are also great for storing other things like food (beans, rice, wheat, etc.) to ammo. Easily carried by attached handle. Holds 3.5 gallons of water or approximately 22 lbs of grain..