These storage containers seemed to be well made and would be sufficient for all but the heaviest use. They are being used for storage, not for the constant moving around of equipment. The size is convenient as it will fit on most shelving units, and the weight when filled with normal items will not be excessive. I personally like the two piece attached top versus a one piece snap on top. The containers are stackable, as the base of the top container fits securely into an indent in the top of the bottom container - good design. Since I needed six, the package quantity was not a disadvantage to me, but it might be to some.