I bought this for myself, I need a reliable water bottle to take out with me as I am out alot and drink alot of water anyway. The lid is a push button one to be able to get to the drinking vessel and nice and hard and when it is empty , the silicone bottle rolls right down and has a clip attached so you just bring it down and over the bottle part then the ring it has on it clips really securely to the cap keeping it tightly shut. Its made of thick silicone so I'm not worried about it getting a little hole in it and ruining my bag. This bottle is great. It’s very light weight and small when folded down, perfect for me!