Our most popular seat bag that maintains a sleek narrow profile even with its added expansion featuregt volume 105 cu in 1365 cu ingt nylon upper is coated for water resistancegt synthetic leather lower with debossed patterngt lower zipper expands the bag for extra storagegt water resistant zipper repels water and gritgt internal neoprene sleeve holds tools and protects tubesgt narrow profile to reduce risk of chafing