The Topeak Rain Cover Tri Bag 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. Large size fits smartphones with screens up to 6”.Topeak Rain Cover Tri Bag 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 smartphones)Compartments: One padded main, Two side pocketsHead Tube Diameter: Fits 53 - 75 mmMaterial: 600 denier polyester, Inner: waterproofed 70 denier ripstop nylonProtection: Padded main compartmentSize: 14 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)Top Tube Diameter: Fits 38 - 52 mmWeight: 65 g / 2.29 oz (Medium), 80 g / 2.82 oz (Large)