I've been looking for a dead simple day pack more for urban and travel use than hiking. I picked up a MontBell Pocketable Daypack 20 today and I think it will do the trick. It is a simple zippered panel-loading pack with a large 10.5"x10.5" zippered front pocket and a 7"x7" hanging pocket inside that forms a self-stowing stuff sack, 3-D mesh padded shoulder straps and a hang loop. That's it! And it weighs 8.2 ounces on my scale.

Manufacturer's specs:
Weight 8.5 oz. [my sample is 8.2oz]
Fablic 210-denier nylon
Compressed size 7.1" x 8.3"
Other One size fits most
[Size] 19.7" x 11.0" x 5.9"
[Capacity] : 1220 cu.in. / 20 L
http://www.montbell.us/products/disp.php?p_id=1123649
So many small packs are cut like a cylinder and ride too high on my pack, like a rabid raccoon has jumped on. This is even more clumsy in urban environments where you can wipe the nose of someone standing behind you with your pack. I did this on a Roman subway at rush hour and got a good lesson in Italian cussing. This pack is nearly 20" tall at the back panel and 11" wide and I measured 6.125" deep at the bottom. It rides well for the size.
I like the shoulder straps. They are 2.75" wide at the top and take a natural curve to the outside as they taper. They are long enough to actually fit an adult male (I wear a large top) and have ample webbing for a wide range of adjustment. They wrap smoothly around my shoulder tops and the ladder adjuster ends up 4" below my armpit (I usually wear a long torso pack). There is no sternum strap or waist belt and I don't feel the need for either. It will carry comfortably on one shoulder as well.
This may be a good candidate for a GoLite Ion replacement. It would be easy enough to remove the hanging pocket inside and it begs to have a bungee cord array and mesh side pockets added, although I think I'll use it as made.
Montbell does offer similar packs in 16, 15 and 11 liter versions, although the weight doesn't drop below 6oz for even the 11 liter model.


