My oldest and holiest bag is of paisley fabric in drab colors. It started life as a grab-bag of rocks picked up at a gem & mineral show when I was a kid sometimes in the early 80s. But most of my dice are really scattered across numerous bags and boxes of various sizes and sorts in various places, mainly because, as a chronic mover/traveller, I keep all my junk spends scattered across numerous bags and boxes of various sizes and sorts in various places.
The dice bag I have to hand right now is just unbleached cotton fabric, containing a handful of wooden d6s, a mixed set of black and red plastic polyhedrals, some extra d10s in green, a dozen or so pennies, and 5 facsimile knucklebones.