I’ve read a few reviews of it now including this Pinkbike one
It should only need to accommodate water, tube, Wallet phone (Pump and go on the frame), from looking at the Montane that extra capacity could well lull me to carrying more stuff than I really need, more weight = more bounce, keep the weight down, hopefully the bounce won’t be so bad ,a lot of the reviewers seem to suggest wearing it a little higher in the small of your back/lumbar…
the only other slight concern would be the hose/clip, if it doesn’t hold on, or pulls my clothing about a bit Ican see my getting annoyed by it…
I think I might just give it a whirl for £20, I’d not even it consider at RRP…