This is Topeak's Midloader Frame Bag. It was design for very heavy bikepacking by using typically unused space. Features: Designed to employ the unused space beneath the top tube, the Midloader is designed for the heaviest of bikepacking gear Constructed from lightweight yet durable, highly water resistant materials Dual weather resistant zippers allow easy access from either side Mounts securely with hook and loop fasteners Newly updated attachment strap for improved security in installation Specifications: Pack Type: Frame Bag Pack Capacity: 3L, 4.5L, 6L Mount: Hook & Loop Straps Waterproof: Water-Resistant Material: Polyethylene/Nylon Dimensions: 14.8 x 4.7 x 2.4" (3 L), 18.1 x 4.7 x 2.4" (4.5 L), 21.5 x 5.3 x 2.4" (6 L) Color: Black Weight: 169g (3L), 195g (4.5L), 337g (6L) Shop our selection of Topeak 'Loader' Packs.