Good Quality Rucksack / Backpack (off the bike, hiking)

I just ordered the eastpak one, 25 quid seems like a good deal. My karrimor has only lasted a year before starting to split where the straps connect to the top. Quite annoying as apart from the build quality it's a very good bag

Its lasted about 4 months before I got annoyed with it, too small for day to day stuff, the threading holding the zip has started to spread a little bit after I forced a jumper in there a few too many times. Apart from the size, its still pretty awesome, will relegate it to MTB days

Can anyone recommend something just a bit bigger?