Capacity 0.6 L /36.6 ci Compartments One Main Material 420 Denier and 840 Denier Nylon Waterproof Fabric, Sonically Welded Seams Protection Padded Ma...in Compartment Bag Attachment Nylon Straps Head Tube Diameter Fits 34 - 75 mm Top Tube Diameter Fits 38 - 52 mm Added Features Good for Holding: PDA Mobile Phone /Energy bars /Wallet /Tools ...