The Top Open Mesh Drop Box lets you make use of that empty space under your seat. The top on either side of the seat has a zipper for easy access and security in case you have too much fun and flip over. Depending on the model, this bag drops right into a small, medium, or large opening with the flexibility to go in a slightly different size opening. See dimensions below. All Whitewater Designs products are proudly sewn in Eugene, OR.