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#16 sewing needle and #46 or #69 bonded nylon thread (or dental floss, medical sutures)
6 safety pins (various sizes for gear and clothing)
6 feet of duct tape (wrapped around a dowel or short pencil)
4 plastic zip-ties (coil around inside of container)
Nylon adhesive patches
Plastic webbing buckles
10 feet of copper wire (coiled around dowel)
1-ounce tube of McNett SeamGrip adhesive ($6.50, mcnett.com)
10 feet of 150-pound test Mason’s line (a utility cord available at most hardware stores)
Plastic soap dish
This everyday item is lightweight, roomy, and prevents needles from going missing or causing punctures. To ensure the lid stays shut, wrap several thick rubber bands around the outside. Pack some cotton balls inside on top to keep the contents from rattling. Cost: Less than two bucks at drugstores like CVS and Walgreens.
Fire tinder (cotton balls soaked in petroleum jelly)
Flint and steel
Water purification tablets (foil-wrapped)
Lightweight signal mirror
Energy drink packets
Sea-to-Summit Dry Sack, XXS
This one-liter roll-top dry bag can fit in the smallest corners of your pack and still carry all the emergency items you’ll need. Fully taped seams and laminated 70-denier nylon make it waterproof, while a white lining makes it easy to search inside. Go with size XXS, which measures six by nine inches and weighs one ounce. $8; seatosummit.com.