We are taking a short trip with a group, and I needed a way to keep my day stuff organized in my back sack. This organizer had a place I could put everything from umbrella to sanitizer to water bottle, and it still fit in the back sack, so that the top would draw shut. I have always hated needing to use the back sack, because everything has always been in a heap at the bottom of the bag. Not this time! Check to make sure it will fit your sack, I have a small sack that it wouldn't fit, but it fitSee full review