Well, since no one else said so, my first step is research. The straps on the '28 Packroll are different than on either the '44 or '45 packs, are different than the '36 mussette bag.
The mussette bag was highly prized since it was a convenient size, and it had short stub straps with snaps in the ends. Those snaps were meant to clip into the '36 suspenders, or to a strap with rings in either end. That means a mussette cand be tied off with cord or wire, yet still “gotten to” quickly.
The WWII packs had a mix of either narrow straps, or wide straps, or relied on the suspenders, so you have to know which pack it is.
When the '56 system came in, it offered all sorts of attachment points with cord, packboard straps, or the like. The ALCE/LC-1/2 packs have a very wide padded strap for human-carry use. Those straps are a bear to unlash and feed through tie-off points. The nice sturdy rings on the pack or packframe, on the other hand, are right sturdy, and respond well to paracord lashing.
For US armor fro mthe 80’s on, the poor trea-ah, tankers were required by regulation to have a complete kit of “infantry” gear to don whenever they were on foot. So, they’d wind up with pack and frame, with a Kelvar “fritz” pot, and later the PASGT vest for all of the crew. This needed to be lashed down securely, but also still be readily available for donning (if there’s anybody watching ).
My “druther” for pack straps in 1/32-1/35 is a testured tape over either lead or similar foil. How much texture depends on the strap, and the widths & lengths needed. But, that’s me, others differ.