Apidura, makers of dang tough bikepacking bags have evolved their Backcountry Saddle Pack to be compatible with dropper posts. This is thanks to a nylon sleeve that glides up and down the dropper stanchion while securing the pack to the saddle rails. This pack has reinforcement in the form of a skid plate in case it hits the tire at some point, a loop for a light on the back, reinforced stitching, and weighs a mere 265g with a retail price of $156. See more at Apidura.
For ultra-distance competition and audax racers, they seek the most ultralight gear for their races. Apidura has recently developed their own ultralight, waterproof laminate for a line of bags dedicated for such races and have designed three new bags in their new Racing line. Included in the lineup is a 5L Racing Saddle Pack at 200g, a 5L Racing Handlebar Pack at 265g, and a 2.4L Racing Frame Pack at 145g. See the full lineup at Apidura.
Using ultralight Dimension-Polyant VX21 materials, Apidura has designed a series of bikepacking bags that are ultralight, tough and waterproof. This saddle pack, along with all of their other bags, comes in two sizes and is in stock now at the Apidura web shop.