I tried on numerous rucksacks at the Belfast store and with some great advice from a very friendly member of staff, decided on this as the best fit.
I have used it for a few overnight hikes and managed to fit a Force 10 Hellium 100 tent, Therm-a-rest Prolite regular mat, Vango Venom 150 sleeping bag, Jetboil Sol, 2L Osprey water bladder, wetproofs, food and a few survival bits and bobs into this little gem!
It fits like a glove (thanks again to the staff for advice!) and even while scaling small mountains I never felt like the bag was cutting into me or moving about as I have experienced with other rucksacks.
The tiny bit of extra weight is deffinitely outweighed by the comfort of the bag and the included rain cover does its job for sure ;).
Oh and don't forget, Osprey bags come with a lifetime guarantee, not that the bag has shown any sign of wear after shed loads of abuse, it's still very reassuring!