I bought this for my husband, who used it for work and carried a lot of heavy stuff on it and used it a lot on uneven surfaces on a daily basis (they do a lot of construction on the sidewalks in our city). He had managed to break lesser ones in about a month. This one lasted him about 3-4 before it gave out, so maybe I should rate it higher, maybe he's just really hard on the things, but it says they can carry the weight he puts on them, I guess just not on a daily basis.