In reply to Paul Evans:
Osprey are excellent but obviously premium priced, though I picked up one of their bigger (90l) bags on Sportpursuit a year or so back for a lot less than the going rate (guess there's not much demand for that big).
I can get the OP's issue with Vango - the tents are decent provided you stay away from the budget end but I had a Vango rucksack years ago and it was rubbish, poor quality and the straps kept slipping.
Decathlon is the usual recommendation for cheap and cheerful but I don't have any experience of their larger sacs.
Some of their stuff is a bit quirky but if you don't need a huge sac Alpkit might be worth a look.
Post edited at 12:39