I got myself the Tasmanian Tiger Bug-Out-Pack.(pic related)
Volume of 40 liters, MOLLE-webbing on the sides, front, bottom, and inside the main compartment. Inside the different compartments there are additional pouches, fixings, d-rings, and so on for better organisation.
The main compartment opens up the whole way to the bottom and holds fixings for a hydration-system.
I recommend a maximum weight of around 10 kg (so roughly 8 kg payload). with this weight it is a very comfortable carry and you would barely notice the bag.
On the downside, even while it looks very cubic, the inside of the main compartment is not due to the carry-system. The backplate is slightly bend so you have to keep that in mind when packing.
Tasmanian Tiger is the military division of the German company Tatonka and well known for the quality and durability of their products among the German armed forces even though they are manufactured in Vietnam.
For more information and pictures visit
http://en.tasmaniantiger.info/shop/rucksacks/tt-bug-out-pack/You will also find a wide range of (militarystyle) bag(-pack)s, MOLLE pouches, and additional equipment.