Had one in OG, quality seemed pretty solid. Not that surprising as Karrimor SF are supposedly doing the new issue daysacks. Pouches were a good size and had velcro closures with the strips to cover them if you don't want to use them. Pocket on the back for a water bladder which supposedly takes an issue 3l camelbac with cover.
In my experience 3l is way too big, stuck out the top of the pocket by miles and you'd never be able to clip the cover and side panel together at the top to keep them secure/neat. Might be just alright with only the bladder, but there's not much more than two velcro straps on the back to stop it coming out. More importantly, I found the quick-release clips on the side panel wouldn't work with issue ones. Tolerances on the female part weren't quite right and male PLCE stuff wouldn't "click" in. Seems odd given what it's made for, maybe I got a bad one?