Our Hudson bike saddle bag quickly fastens to the underside of your saddle and seat post with super-strong fastener straps. Stopped somewhere on your ride and need to take the bike seat bag with you? The Hudson comes equipped with a wristlet strap and waistband clip for easy off-the-bike carrying options. All in the details We designed this bag to meet your needs and surpass your expectations. Just check out these tech specs: Size W 3.5” x H 7.5” x D 3.25” Fits Devices Most smartphones Volume 1.6 L Weight 5 oz Max Load Capacity 5 lbs Water Resistance Coated fabrics and zipper Nighttime Visibility Reflective stripe with area for clip-on bike light Pockets 2 total. 1 Exterior pockets and 1 interior. Strap Details Detach wristlet strap and belt clip included Attachment Style 2 Premium hook and loop (also called velcro) straps, with elastic to ensure a reliably secure fit, a seat post attachment strap