The bike bag is REALLY small but large enough for a cell phone, garage door opener and keys. There are no instructions on how this thing gets attached to the bike but since the straps are fastenened with velcro, you just make do with what you are given. There is nothing wrong wtih the bag. However, I did think from the given dimensions, that it would be a tad larger. Made me think that I could have gone to a discount store and gotten a small fanny pack and tied it to my bike with the same result.