I was inspired by the wildcamping / running article recently to want to try a running bumbag thing, I've been using a decathlon 10L vest for a few years but like the idea of my shoulders being unencumbered.
https://www.ukclimbing.com/forums/ukc/fastpacking_-_without_a_pack-748814
The chap in this article uses the Sierra Designs 7-10 (and somehow magically gets a full camping set up in there!). I was thinking of getting one for general long runs, but wanted the larger one so I could put hoodie/baselayer, waterproof coat/trousers etc.. Maybe even use it for hiking as well just to feel a bit lighter on my feet.
I've had a look around on websites like ultralight outdoor gear and can't see anything quite the same in terms of size (that includes two bottle pockets etc.) Reviews seem pretty decent and say it doesn't bounce around etc.
Has anyone got experience running with these type of things, what are they like? I've never used one before and £55 is quite an investment for a jump into the unknown.