It’s really funny that this comes up. Back in Nov’05, when the subject of pack loading and CG came up, I had been emailing some Forums participants and one gear manufacturer. Talk got around to something I semi-facitiously called the “Sumo”-pack. I think that you can picture it. Not for real hi-volume, but an extension of a 1000-1200 in^3 lumbar pack (I have an older heavier mother-of-all-lumbar packs that’s 1150cc – the width of the back, with a volume in the small of the back below the shoulder blades), that packs maybe an additional 900-1000 in^3 around the waist “Sumo” style (I currently have a 450cu in fanny pack which, until I bought an SMD Essence pack with hip-belt pockets, I would wear in front of my abdomen when using a G6).
Depending upon one’s natural girth more or less could reasonably be carried there without protruding too far out to the front and sides. You don’t want to interfere with bending or stepping up, or holding your body close to some rocks when climbing up or down. All of the weight is basically, as far as is feasible, carried near the body’s natural CG, somewhat like the locations that we naturally pack on the pounds anyways.
I’ve always thought since I first saw Sumo as a kid that this would be an interesting way to carry gear as it would not interfere as much as a traditional pack with the body’s natural balance point.
An extension pack with shoulder straps could be deployed from out of the lumbar pack if more volume is needed at the start of a trek, like when we are carrying more food (this idea does already exist on at least one large lumbar pack I saw a few years ago.).
Drawbacks are mainly volume related since we don’t want to interfere with bending and leg movement. Oh…and don’t run into any backpacking “Shallow Hal’s”, or they might become overly enamored with the shape…er…with the gear.
Even for summer hiking, I still have concerns about fitting all of the gear, not so much total volume of ~2000 in^3 without deploying the, maybe 500 in^3, “extension pack”, but, rather this pack has more smaller pockets and perhaps not enough larger ones for bag and tarp for instance.
Ok. So, other than the drawbacks mentioned, please tell me, what else is wrong with this idea?