While I was on the trip in Brecon Beacons I got to take out my Deuter Guide 45+ Daypack, I've been really pleased with this pack so decided post my review.
Physically its a robust pack with two sections and plenty of access zips with the main compartment having a top and two side opening, the lower section with a sturdy zip too. the body is slightly narrow as with most Alpine packs. The back section is really comfortably padded along with the shoulder straps.
I took this out for its first longer test on the Brecon Beacons and it did a great job, packs well as once you gear is in the straps tighten up to make the pack very secure, as for comfort once the pack is on and the chest/waist straps fasten you hardly feel it. I did some light running with it even and a good paced walk no rubbing at all.
I'm very happy with this pack its a great size for a daypack, well constructed versatile.