Bistitchual

A bag made with interlaced sprang weaving, and a braided drawstring. Sprang weaving is amazing!! My brother abused the heck out of this thing for years and it held up really well. It's perfect for bags (and pants), because it's super stretchy width-wise and completely inflexible height-wise. I learned most of what I know from one of Carol James' books , but there's so much I haven't tried yet.
Basically, the concept is that it's like weaving, but with only warp threads and no weft. You start with a warped loom, but then you twist the warp threads across each other. Each row you (usually) twist the threads across each other in a different way. Like maybe on row one you twist each thread with it's neighbor, and then on row 2 you skip a thread and do it again so the pairs are different, then on row 3 do the original pairs again except twist them the opposite direction, etc.
In yet another example of modern historians wildly misunderstanding/undervaluing the "women's work" of ancient textiles, check out this amazing article on the history of tight-fitting colorful clothes! Spoiler, it was probably sprang.