Been riding with this pack now for a couple months and almost everything about it is great. Much easier access to tools when fumbling around on roadside repairs. And this is a great application for the BOA strap. Only thing is the pack tends to gradually come loose--the roll starts to squeeze out from the BOA strap. It happens slowly, so I just check it before the start of each ride. I'll keep adjusting the pack job too to see if I can get it better.
It is simply amazing how smart and simple of a design this seatbag, my chosen application for it, but can be attached to other Ortleib products, is. The clean look, amazing one simple pocket that holds more than you may think. This is my second bag, use this one for gravel and carry all the essentials CO2 inflater w two vials, Multi tool, wheel Boot x 2, spare Schwalbe Aerothan tub, tubeless tire patch kit and one tire lever wrapped with Electrical tape. Cannot go wrong with this bag and simple design, also allows for rear lights or Garmin Varia Radar for the road bike vs bags that hang lower and wear on your shorts.
I bought the Stealth Pocket for my top tube to use in addition to a larger seat post back that holds my spare tube and other repair items. I use the Stealth Pocket for more frequently used items such as gels, chews, tablets, etc. that I can even access while riding or quickly grab during a brief stop. The bag is narrow which is aerodynamic but that does limit its capacity so you have to make some tradeoffs in what and how many items you can pack.
These are fantastic with all the elements that I love about Ortleib, namely a myriad of adjustments to the attachment clamp that is super easy, built in shoulder strap that also helps tie down load, internal pocket that hold laptop behind and zip pocket in front for storing all easily accessible objects that are needed, tools for commuting or hygiene and other bits that you routinely access when bikepacking. And super light and less bulky to fold down than the classic design with PU. The standard for panniers and 100% waterproof.