Are roll-up jewelry cases or hard-shell cases better for travel?

It depends on what you carry. Roll-ups are lighter, more packable, and fit into a carry-on easily, which is why r/HerOneBag threads tend to favor them. Hard-shell cases offer better crush protection for rings and delicate pieces but add weight and bulk. If you travel mainly with chains and earrings, a roll-up wins; if you carry stone-set rings, a hard case is safer.