By selecting this option we'll add a zippered pocket to your new trampoline from SLO Sail and Canvas. We add the pocket as we are building your trampoline. The pocket dimensions are roughly 15x18" and 4" tall. Dimensions may vary slightly depending on the trampoline because of other things getting in the way of a bigger pocket such as hiking straps and lacing grommets trapeze grommets jib strop grommets etc. We put the pocket inboard of the hiking straps on Hobie 14 and Hobie 16's on the starboard side of the trampoline. Prindle trampolines will have the zippered pocket on the port side of the trampoline inboard of the hiking straps and opposite the standard halyard pocket we include on all trampolines. Our zippered pockets feature a large marine grade YKK #10 zipper with corrosion proof Vislon slider."