XS fits Talon 11 well. I like the bright color. it looks really nice in rainy and foggy forests or mountains.
I do hope though, that it comes with different versions that can be secured on different backpacks. I mean, there is loop on the top of this rain cover but i cant hook it up or tie it anywhere on my Talon 11. On one trip, strong mountain top wind blew it away... I have to order another one now.
I wanted to provide verification that the XS Hi-Viz raincover fits the Osprey Talon 22 (mine is a M/L) just fine (see photos). It's simple, but it does what it's supposed to do. The integrated pouch is nice in that it provides a convenient way to store the cover when not in use and will not be lost when the cover is deployed as it's sewn in. The reflective writing/drawing is an added bonus for anyone who might be using the cover any time other than in daylight - this especially useful for me as I run-commute in an urban area. Trust me, the reflective material works.