Rucksack / Shoulder Strap Panniers?

I'm a student and about to start cycling the ~10 mile commute to my placement.
I'm looking for a pannier that I can fit onto the cycle rack while I cycle, and then lift off and be able to carry around for the day, either as a rucksack or on a shoulder strap. I've seen loads of great bags from Ortlieb, but they're all waaaaay out of my price range!
Does anyone know of bags like these on a budget?!
Thanks guys!
I'm looking for a pannier that I can fit onto the cycle rack while I cycle, and then lift off and be able to carry around for the day, either as a rucksack or on a shoulder strap. I've seen loads of great bags from Ortlieb, but they're all waaaaay out of my price range!
Does anyone know of bags like these on a budget?!
Thanks guys!
0
Posts
Another reason to give the Edinburgh Cycle Cooperative store a go is that they very much cater to the student population and have stores in a number of big cities.
Dead easy to yank off the bike and throw over your shoulder, and big enough to hold a change of clothes, a spare tube and assorted work stuff. It's not completely waterproof, but I just put my clothes in a plastic bag.
If you are after a rucsac, the Alpkit Gourdon-20 is a pretty unbeatable value for £22.50 including postage - when it isn't sold out.
It is a 20-litre drybag and Alpkit are very good with customer service. I do use mine (1-year old) on the bike when I am not using panniers but I do use it a lot for hillwalking/scrambling, where because of its lightness and simplicity it is my favourite daysac.
I have a pair of Vaude aqua pro panniers, which have lasted 20,000 miles commuting with only superficial damage to the one that I use (after a few offs). They do cost a fair bit but are fully as good as the ortleib ones, and will last a long time.