...something rough on the match holder would make it easy to open with cold hands wet hands.
Anti-skid tape (adhesive on back-side, often for stair-tread use, available in different widths/colors/grits at Home Depot etc) ... two pieces cut to, say, 1/2-in. x capsule-circumference and attached to both halves of capsule would do the trick.
If you feel like spending a bit more money

, get the
glow-in-the-dark version.