[Closed] recommend a good backpack for commuting...

OMM - last for years, not to hefty, not too big but you can enough in.

I have a Deuter cross bike one which is great, but I'm looking to get an Alpkit gourdon - which is a lot cheaper and probably better for commuting purposes, as you can just shove stuff in and not worry about the the rain cover..

As a commuter, I would advise using panniers or in my case a pannier. No sweaty back, no chaffing or restricting etc.

Pannier ftw.

Ortlieb are fantastic...but not £50. Totally waterproof

Polaris do a 30 litre fully waterproof rolltop one in flouro yellow. Not too comfy for riding when full, but i use it on my scooter and has survived the worst weather and a crash with no damage or leaks.

my mate has an osprey, was tempted myself but will wait till my lowe alpine dies. very nice 25litre sack though reflective bits top zips bladder compatable.

Been using an Lidl £10 jobbie for the past year, it has been good. Will be using a Alpkit 25L drybag type rucksack, for £22.50 they look brilliant!

I currently use a 6 year + altura bag, I would like recommend using one that has a frame inside it

Osprey Momentum. Got a padded laptop compartment and all the touches you need.

carradice sqr saddlle bag is what you want, use mine daily, so far way better than either panniers or a back pack, both of which I have used. http://www.wiggle.co.uk/carradice-sqr-slim-bag-including-sqr-bracket/

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Overboard roll top waterproof backpack, mine's a 20l, fits everything you need in for the commute. Even floats while keep everything bone dry! (Tested in the bath :D) Got a zip pocket inside which is handy for keys/phone/wallet, loads of handy straps and buckles and stuff. Plus it's available in bright colours for night riding. £35 - £40 from various online retailers, would choose mine over many more expensive bags TBH!

+1 Ortlieb
currently using invo-8 race pack. not that waterproof but ergonomically great.
But thinking of panniers now as just ordered a dolan prefisio

Alpkit Gourdon
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Cheap, waterproof (Seriously, once you roll it up, no water's getting in) and tough.

I also use a alpkit gourdon and highly recommend them. I use the 20 litre version as I only need to carry my clothes and lunch. Personally I would not use panniers unless I was carrying a lot of weight.