Very sturdy and durable. Definitely water proof. I love the slow-close/open lid feature. I can stuff all 6 patio cushion backs in it and a small throw pillow and it still closes. I don't use it with the additional lock feature. It wasn't horrible to build. Can fit a 3 year old and 8 year old at the same time for hide and seek (or a small child and adult)! It's bigger than our bathtub. Great for the patio.