I got to use the 30:30 during the Bozeman Ice fest last year and thought it was pretty good when compared to all of the above. It's definitely a solid 40L (NOT the cilo gear "40L" but I bet it's as big as the Speed 40). I have big shoulders and traps and I got one with the long shoulder straps. Shoulder straps were comfortable. Unfortunately, the webbing waist belt left a little to be desired. I'm all about webbing waist belts, however, the 30:30 will sag quite significantly so the bottom of the pack feels like it's down below your ... backside. If I were to buy the pack, I would ask for a stiff hip belt from one of the larger packs. Cilo Gear packs are a little rough around the edges...It's part of their charm. The current two packs I own are the old style mountain hardwear summitrocket 40 with the roll top closure (it's great but dying quickly and you better pack it right if you dont use the bivy pad...which I never use) and the crux ak 57x (now this is an awesome pack but the torso is a bit short for the size, I think. I measure a 19" back and have the size 2).