Quick Release Attachment system Stowable Padded Shoulder Straps External Pocket With Waterproof Zipper Removable Padded Labtop Sleeve 25L Capacity Waterproof external pocket Taillight mount Whistle built into sternum strap buckle Removable single shoulder strap included Adapters included to fit 8mm, 12mm, 16mm and 22mm rack rails Dimensions- 19.5 x 13.25 x 6in (23.5in Tall Open)