Wolf Tooth has grown their B-RAD lineup to include these Pump Bags, ready to carry whatever you can cram into them. Perhaps even a Sin Dawg from the looks of it? I’ve been using a similar, yet a lot smaller bag for some time now, carrying the Silca pocket pump, or a Dynaplug with a Co2. If you’ve got bottle bosses to spare, these nifty bags can put them to use. My personal favorite is the underside of the downtube, particularly on a touring bike or hardtail, for when you don’t need three full bottles. See more at Wolf Tooth!