The Lone Peak Shorty Rack Pack is spacious enough to hold four cans of soda in its main compartment, with room to spare. The Shorty is perfect for bikes with limited seat/rack clearance problems, or for use with seat post style rack systems. The main compartment opens fully for easy access via a heavy-duty YKK zipper. The Shorty Rack Pack features premium hi-density closed cell foam padding on the sides and bottom of the main compartment, so it is well suited to carrying camera gear or other fragile items. The addition of closed cell foam will ensure exceptional performance, bag stability and lifetime of sag-free performance. The Shorty is constructed from 1000 denier textured nylon and its American made construction reflects Lone Peak's attention to detail, including a top carry strap when off the bike, 3M reflective material sewn on rear for added nighttime visibility, Lone Peak label taillight hangar mount, genuine #5 YKK zippers, and the Shorty Rack Pack can be solidly anchored to any rack by its four vertical hook and loop straps.