Every piper should be caring a kit in his/her case with what I feel are the following essential items:

• Extra chanter reed/s. Every piper should have more than one playable reed on them at all times.
• A roll of tape. You never know when your going to have to flatten that chanter.
• Exacto Knife: Good for cutting hemp, carving your chanter or shaving the reed a bit.
• Razor Blade: Same as above, but you can't carve a chanter very well with it.
• Hemp: You might need some to steady the drone on the tuning pin or tighten the joint in the stocks.
• Bees Wax: If you don't use black wax you'll definitely need this. Even if you do it's not bad to have in case somebody else is ill prepared.
• Black Wax: Same as above.
• Awl: You'll use this to open up the reed throat if it becomes necessary.
• Orthodontic rubber bands: These things come in handy for adjusting chanter reeds, shutting off drone reeds and such.
• Screw Driver: You will only need this if you play the Ross Bag or feel like having a cocktail :).