The Wolf Tooth B-RAD Pump Bag is a low-profile Pump Bag, but this bag is large enough for a pair of 29er tubes or lightweight jacket, wallet and even a cell phone. The Wolf Tooth B-RAD Pump Bag has four mounting grommets that mate with the B-RAD 3 or 4 base, frame water cage bosses, or top tube fuel tank bosses. It can also be strapped to most frame tubes using the included silicone-backed hook & loop straps. Wolf Tooth B-RAD Pump Bag Compatibility Can be mounted directly anywhere there are bottle cage mounts. For the most secure and adjustable mounting, use a B-RAD 3 or 4 Base If mounting directly to frame bottle cage mounts, be sure to use protective tape where the metal grommets (holes) might rub Can be mounted to most any tube on the frame with the included silicon backed straps Holds pumps up to 12 inches or 30cm long with room to spare for tubes, phones, tools, clothing and other ride essentials. Note: always check for appropriate clearance under all riding conditions including under full compression on a dual suspension. Wolf Tooth B-RAD Pump Bag Recommendations When mounted on the underside of downtube check clearances before riding Choose 2 of 4 grommets spaced at 64 mm (they are the same pitch as bottle cage mounts) Wolf Tooth B-RAD Pump Bag Specifications Weight: 114g Dimensions: 12 in x 2.5 in x 2.5 in (30 cm x 6.5 cm x 6.5 cm) (1.9 liter capacity) Silicone-backed straps fit tubes up to 2.5 inches in diameter Material: PVC backed 420D ripstop Nylon for added protection against the elements, water resistant YKK zipper, silicone-backed straps Made in the USA