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Decathlon have their 10l pack on sale ATM for £20. You could do a lot worse.
Alternatively I'll be shifting a Ultimate Direction fastpack 15 soon if you're interested. Good condition but I snapped the zip pull tag on the phone pocket. Can get some pics if interested. Bag is good just wrong size for me since I lost a bit of weight.
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I have an osprey one, fits my laptop and a change of clothes, has an expandable pocket so I can stuff more things in there. Also has space for a bladder though obvs I don't use that for my epic 5km commute. I love this bag so much even though it's starting to smell bad now...
Thanks to the weather and needing a coat/more clothes, all my run commutes are currently done with my much larger and much more uncomfortable (normal-style) rucksack. Do not like.
Speaking of run-commuting (and trying to steer the conversation away from more poo stories because they scare me), is there a forum-favourite running backpack?
It probably wouldn't need to hold more than a lanyard, boxers and socks, maybe a shirt and a book, but if it could hold an A4 textbook or ring binder that would be even better.