Great question — answering as the UphillTech team:
Chest and waist or hip belts can often be extended or replaced with longer ones. While it's possible to lengthen them, modifying the shoulder straps in any more significant way is much harder. If you do need to modify straps, the more standard the fittings, the easier it will be. So it's more important to get a pack that fits, and that puts the lower belt in the right place, than to find belts that work as standard. The lower belt on a pack that size should sit in a way that it can take some weight without having to be so tight it squeezes you. My mountaineering pack, long out of production (a Karrimor Alpiniste), has a more generous hip belt than my more ordinary packs - that might be a...
Full answer by Chris H: https://outdoors.stackexchange.com/a/25828 (CC BY-SA 4.0).
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