A 53 piece tyre repair kit in a storage box.

A plug kit is the highest-value tool per dollar in the entire vehicle. A puncture a long way from anywhere is a trip-ending problem if you have one spare and no way to fix anything; with a plug kit it is a twenty-minute delay.

Plugs work from the outside, so the wheel stays on the vehicle — no jacking, no breaking the bead, no wrestling a tyre off a rim on the trail.

53 pieces means enough plugs and tools to deal with several punctures, not just one. On sharp rock, punctures rarely arrive alone.

A plug is a trail repair, not a permanent one — have the tyre inspected properly when you get home.