My local Asda is 4-5k away, I quite like some of their prices, so I take a walk over about once a fortnight and fill a bergan. Build exercise into your routine... So I'm trogging back yesterday having went daft on cheap spuds, carrots, apples, onions, cans.......everything dense. I'd bought so much I had two carrier bags as well. It's p*ssing, I can't clear my runny nose, I've got pins and needles bad in my hands, I'm thinking, "This isn't as much fun as it used to be". Got home and weighed it. F'kin hell - 101.5lb in the bergan and another 17lb in the bags, plus the weight of the bergan - say 120lb. Now the interesting thing about that weight is that on the flat it doesn't really take much out of your legs. As soon as you go uphill it knackers your thighs, but bimbling on the flat the unpleasantness is caused by the pain in your shoulders. In addition, I find it impossible to generate any speed. There's a kind of natural trudge speed of about 3mph. The weight seems to kill and shorten each stride. If you try to hurry the aerobic effort isn't that great but everything starts to settle into simple harmonic motion, and you've got 100lb plus whatever the impulse is. So, two thoughts. 1) Would it be possible to make a mould for the shoulders to do a better job of spreading the load? I don't think waistbelts work that well, particularly if you need other belts under them. 2) This sounds mad, and it couldn't work on broken terrain, but on flat rolling ground you wonder if it is impossible to stick some wheels in the bottom of the bergan and toe the f****r with a fixing point in the middle of your back. And no I don't think it should be tartan The North Vietnamese used bikes and pushed them. Actually quite clever. Big bike wheels bridge potholes. I know that ideally you don't want to carry weight far - bergans should be centralised and moved by vehicle - but if you have to manpack a load of weight on rolling ground you are doing an awful lot of work, and suffering a lot of pain, just wearing it.