I've got one of these - happened to be staying near a branch in that week - so was able to indulge my addiction to rucksacks (Is there a Rucksacks Anonymous?)
It's a fully featured i.e. lots of pockets and lashing points on the lid, 34 litre pack with a trampoline back made by a German company called Kober who apparently have been making them since 1873. Weight is about 1kg.
I loaded it fairly full (about 6 kg) to try it out and it was reasonably good to carry. The trampoline back was fairly flexible so the actual gap is quite small. For this load I felt that the hip belt was a little too small with insufficient wraparound. I don't think it carries as well as my cheapish Gelert Oxygen 35 litre which has a similar size
Not sure whether I'll keep mine as I have similar sized ones already, but for £17.99 it's excellent value (Like much of the Aldi/Lidl stuff).Gues they'd sell out pretty quickly.
Dave
BTW - THe TGO is doing Osprey Kestrel 28s free if you take out a sub.