From micro adventures to multi-day or -week bikepacking tours, the ACID PACK PRO 15 was developed in cooperation with experienced bikepackers. The two-piece system includes a harness and a waterproof dry bag with welded construction for maximum functionality. Using the flexible MOLLE system, the harness securely attaches to the saddle rails and seatpost where, once fitted, it can stay on for as long as you need. The rugged dry bag simply slots into the harness and fixes in place, and is just as quick to remove when shopping for supplies or when you've arrived at your destination for the evening. Another feature: an integrated air valve that allows the contents to compress down even further. Reflective details on both parts improve visibility on the roads in low-light conditions. There's also an attachment for mounting a tail light.