The Topeak Tri Bag quickly mounts to the top tube of your bike for quick and easy access to energy bars or any small essential gear you need to keep close at hand. Two side pockets for extra capacity. Large size fits smartphones with screens up to 6”.Topeak Tri Bags Cover FeaturesAdded Features: Good for holding PDA, mobile phone, energy bars, wallet & toolsBag Attachment: Nylon strapsCapacity: 0.6 L / 36.6 ci (Medium), 0.72 L / 44 ci (Large), Fits up to 6” screen smartphonesCompartments: One padded main, Two side pocketsHead Tube Diameter: Fits 53 - 75 mmTop Tube Diameter: Fits 38 - 52 mmMaterial: 600 denier polyesterInner : Waterproofed 70 denier ripstop nylonProtection: Padded main compartmentTopeak Tri Bags Cover Size14 x 10.2 x 4 cm / 5.5” x 4” x 1.6” (Medium)18 x 10.2 x 4 cm / 7.1” x 4” x 1.6” (Large)