I use this on my race day bike. It weighs 1.7 oz on my postal scales. There's enough room for my tube repair kit and a few extras. I like it because of it's easy access. No more stopping, getting off my bike, unzipping my under-the-saddle bag, rooting around and hoping nothing falls out.
Works great on my Fuji Gran Fondo. As others have stated, it is smaller than you may expect. But it's great for holding a bar, gu, and a small baggy of dried fruit. Looks to be well-made and is easy to install.
I use the Stealth Pocket on my road bike for storing gels and other essentials.
Use it to store spare tube but barely fits
