Described herein are units for transportation of cargo, and methods of using them. In some embodiments, the units are collapsible, stackable cargo units. In some embodiments, the cargo units include a generally rectangular base having a front, a rear and two sides, with forklift slots on its front, rear and each side. The cargo units may further include front and rear walls extending upward from the base. The cargo units may further include first and second side walls extending upward from the base between the front and rear walls. The first side wall may have a length greater than the second side wall. The cargo units may further include an integrated lid hingedly attached to one or more of the front, rear, and side walls.