I have an Osprey Talon 33.
It’s a fantastic all round lightweight bag for hill walking, scrambling, climbing etc
Helios has already said this but its a bit of a tardis so you find yourself stuffing it to the gills. It’s very big for a 33L bag but when only half full it compresses down well with all the adjustment straps.
I’ve used mine as a travel bag, winter hillwalking, via ferrata, hut-to-hut in Spain etc etc. The exterior pockets are really well designed too
It’s over 3 years old now and has been used an awful lot! It isn’t in perfect condition any more but it really has been excellent, it’s so good you’ll be using it for everything.
If you want it for MTBing 90% off the time I suggest get the 22L version as 33L is probably far too much