I wanted to write this short review to point out that not all Rubbermaid ActionPackers are alike. There are those with side clamps and those with hinged lids and locking front clamps. The previous reviewer was referring to the latter style of container. The lighter units with side clamps DO NOT have a locking feature and the lid comes completely off the container when not secured. I'm very happy with my container since I bought it to store camping gear in the Xtra cab space behind the passenger seat in my truck. I don't think I would ship things in this unit, however. Not heavy duty enough for that, in my opinion.