I've just bought this sack after much deliberation and comparison with others from Karrimor, Blacks and Berghaus. I also compared it with the 35L version (which doesn't have the roll-top main compartment for some reason) and it was hard to see where the 10 litre difference was. Although rated at 25 litres, it seems to have ample space and as much as others rated at 30 litres - particularly those with a concave back system which makes the space available somewhat narrow. Build quality and materials seem very good and as well as the all-important waterproof linings, the sack also comes with a waterproof rain cover hidden away in the bottom. Although accessing the waterproofed compartments is a little unconventional, I didn't find them difficult at all - just roll and clip the buckles. The one thing I did see as an omission was hydration pack compatibility, although the front zipped pocket does fit a hydration bladder as long as the main compartment is not stuffed full. The side mesh pockets, however, appear perfectly designed to securely hold a drinking bottle - being deep enough and not too wide, while the side compression straps provide additional security for taller bottles. All in all, this is a good day sack which will keep your stuff dry and represents excellent value for money.

(Written by: kevan)