I had this huge gap between my toilet & sink so I decided to get this and it's absolutely perfect! Fits exactly in the open slot and I can throw in a couple things here & there inside. The only down side is that the toilet paper storage space is a bit too tight so soft fat rolls of toilet paper don't fit too well - I had to pretty much jam them inside. Best part is it comes pre-built! Although they screw the knobs on the inside probably for safer packing so you have to unscrew them and then screw them on the outside.