If your load approached 30 lbs I don't know if you would want to go really thin. I have children and can't get out for more than three days at a time so with three days of food and 2-3l of water, I almost never exceed 20 lbs. I use a Zimmerbuilt Quickstep with a 1/4" spacer mesh hipbelt (read close to no padding) and it's fine up to that 20lb mark. Want to know why? Because I don't carry weight on my hips with the pack. It's frameless and works great at 20 lbs or less. If you intend to carry any weight on your hips, the hipbelt HAS to have at least a little structure and rigidity or it will just collapse on itself when you try to put some of that 30 lb load on your hips. If you're comfortable with 30lbs on your shoulders then go for it. My $.02.
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