In reply to Andyc1313:
I bought an OMM 45+10 sack in 2008 (which means I can't quite remember which model; it doesn't say, but I think it's the Villain). It feels very 'thin' all over, which made me raise my eyebrows when I first unpacked it, but after 7 years (!!) of steady use, it is still going strong. I've used it in Brazilian jungle, Norwegian mountains, crag sack all over and most weeks, and consistently as my carry-on luggage (it can get cinched down to tinytiny, and can pack nice and square with no dead space (like back venting systems).
I think it's awesome. The back system doesn't look like much, but last summer I had invariably loaded it with 15kg of rock (geologist...) by the end of the day and could happily (well, able-ly) lug them off the hill.
If you are interested I can get the internal dimensions for you re. tent. However, when I have used it for back packing the external harness thing (MSC as mentioned) can be used to carry the tent. I've got a cheapy (read bulky) 2-man vango thing, and the whole kaboodle gets strapped to the outside perfectly happily.
The only thing I wish it had is a floating lid. In spite of this, it's a great piece of kit.