Jonnie, https://militaryluggage.com/shop-by-need/?offset=48 Agree for long hikes, duffels are not comfortable. I’ve used the best of the military packs for short and long treks over various topography. They, too, are not comfortable. The typical comfort factor is weight. It gets technical but let me illustrate that level walking is great with a pack with external frame. Inclines require an INTERNAL frame or none at all. From what I gleaned from the various posts here, you’d be walking, at most, ~ 4 miles over an extended period of time. The large military packs you’d require for non-compressionable garments, etc, are expensive and inherently heavy by design (in re US military). Can’t answer your explicit question on hip belts. Glance at the above link. It’s only for examples; not for any other reason. Plus, web stuff can be expensive versus belonging to some type of association where some can steer you to best buys. Had once worked as an emergency reponder in Asia where some refugees were evacuating with heavy canvas laundry bags having shoulder straps sewn on them. They made it to the emergency shelter. Comfort is sacrificed for safety. Hopefully above has some value for research.