This thing is HUGE! We wanted to get a box large enough to store all our patio cushions and this is more than sufficient. Lots of space, and easy to put together. I appreciate that it has a metal frame inside the lid meaning that it should not warp like other models I was considering. The lock hasp is helpful for keeping the lid closed, but if someone really wanted to get into the box they easily could puncture the plastic (so I wouldn't call it theft proof) but it will keep critters out!