Hi KarenRei,

I'm not aware of any backpack of a similar design you've mentioned. Good idea though but probably goes against the main design criteria most manufacturers are aiming for, that of design weight, comfort, load capacity, waterproofness and durability with ease of access well down the design list.

But the great thing is that there is a tremedous range of superb quality multiday trekking backpacks out there.

I personally would stay away from standard issue military packs as they are designed to carry very heavy loads, tend not to be very comfortable and are consequently very heavy although very robust. There are some military type packs, which are more durable constructions of good quality civilian packs and if you like Olive Drab or Camo these make excellent packs.

There is a good review of the Karrimor Sabre 60-100 available at

http://www.bushcraftuk.com/reviews/carrying-stuff/pri-sabre-60---100-karrimor-sf-range.html

You may also want to consider packs with adjustable height backs to get that perfect fit.

Another personal favourite is the Lowe Alpine Crossbow Expedition 75+15 because of the crossbow design which gives excellent load stability. If you can still find one.

The Berghaus C7 Pro series backpack may also be worth a look as it has a good design balance. (very good waterproofness designed for temperate i.e wet and damp UK conditions)

A good review is available here at
http://www.outdoorsmagic.com/news/article/mps/UAN/3098/v/3/sp/

Hi end Macpac and Force Ten have an excellent reputation also.