Cant say I have problems with mine. Army packs try to fit many different body size's you wont always get that right so they get modded that dose not say to me the kit is bad just they have to average and compromise, main point is there not expensive, but are dam tough
But isn't that an indictment of Army purchasing? The Infantry 90 bergan has a long and short version. Thats it. Possibly OK 30 years ago, but just outmoded now. Adjustable back systems have been around for years (Berghaus had them in the eighties) - my LA Liberty 70+20 is about 17 years old, and has one. So its not new technology, and not expensive either, since Go Outdoors will do one from Hi Gear for £50!
So they could have one pack, which would be more comfortable...
its designed to be robust, and relatively cheap, but not all countries follow this particular course. There was a discussion a while back about the replacement for the old Norgie (itself a garment you never saw in any civilian hiking shop) - it might have been OK, but as someone commented 'the Danish lads get Montane, we get whatever's cheapest'. And thats often the way the army approaches kit. The US Marines, on the other hand, have a very good looking pack, which I understand has been designed by a civilian company, and of course both Lowe Alpine (for the Dutch) and Berghaus make military packs.
The problem with surplus for hiking is that when I've bought stuff, I generally end up thinking 'why did I buy that?'
Even if its not bad, it in turn means its relatively heavy, because of the materials involved. And often its issued for a long time, so its often not very current compared with the civilian market. And even when its OK, its designed for the military - civilians dont need things like Molle, for instance.
The civilian market is much more fluid, and there simply much more choice. And you have to see surplus as just part of the market. That can work well if its what you want, but if its not, you dont need to buy it. And most of the time, its not really want you need for hiking.