Designed to make full use of the space under the saddle, eliminating the need for a rear rack. Constructed from high quality, waterproof materials and optimized for durability and weight. Performs best when used to carry lightweight, compressible gear, such as clothing or sleeping gear – but built super strong to handle other loads as well! Available in three sizes, to accommodate a range of cycling needs. Please note that, while the body fabric of this pack is waterproof, due to the stitching process used to assemble the product, there is the possibility for water to enter the packs through the seams when exposed to sustained rain. We recommend using an internal dry bag for contents that must remain absolutely dry (such as electronics).