Sierra Designs Flex Capacitor Hip Belt Birch Medium/Large. Works with 25-40L 40-60L and 60-75 liter Flex Capacitor packs. Specifications for Sierra Designs Flex Capacitor Replacement Hip Belts: Manufacturer: Sierra Designs Gender: Unisex Weight: 11 oz Pack Application: Backpacking Fabric/Material: Contoured EVA Foam/Air Mesh Backpack Accessory Type: Hip Belt and Shoulder Straps Water Resistance Level: None Application: Backpacking Features of Sierra Designs Flex Capacitor Replacement Hip Belts Countoured EVA foam 2 Zippered pockets Airmesh Adjustble webbing waistbelt Stabilizer Package Contents: Sierra Designs Flex Capacitor Replacement Hip Belts Sierra Designs 85710220BIRHB-M/L: Flex Capacitor Hip Belt Birch Medium/Large