Used bicycle tube cut into rings make the best elastic bands, they don't degrade

I use twine for the same reason. Dirt cheap. Lasts forever. Doesn't leave residue on your cables. The downside is I end up cutting the twine when I need to use the cable but a couple inches of twine in insignificant.

I use cable velcro ties. A big roll of them is cheap.

Garden stores/sections sell circles of green Velcro you can cut; I figure of it's good enough for UV then it'll work in a box.

As a bonus, you don't need to raid her hairbands.

I routinely steal my wife's hairbands to tie various cables in my cable stash. You can never have enough USB cables of various types. But as Murphy dictates, the USB cable that I need now is one that I don't have in my stash.

Bread ties are good too. Sometimes they're too short, but you can twist a few together