The bag has just the size to - A medium-sized smartphone with pocket - An "emergency kit" for tire repair and - The rain cover and contained - A box of tissues and - The house key comfortably into intervention. If you open a zip magnification option goes even more. Bit fiddly I find the Klickfix unlocking when the bag hangs under the saddle. Perhaps I have not yet got the hang ... The zippers are sometimes difficult to move, probably because they are apparently welded rainproof.
Compared to the alternatives on the market that I've looked at (in the shop), this bag is in my opinion the most practical
