A needle, heavy thread and a few feet of tape will get you home

Quick answer: Carry a sturdy needle, a few yards of bonded nylon thread and about four feet of duct tape wrapped around something you already own. Clean the damage, dry it, stop the tear from spreading, then patch or stitch. Treat every field repair as temporary and finish it properly at home.

A shoulder strap lets go four miles from the truck. The stitching has been fraying for two seasons, and you've ignored it for two seasons. Now the pack hangs off one arm and you're doing the math on how far four miles feels with twenty-five pounds dragging on a single shoulder.

That's the day this skill pays for itself. It takes about ten minutes to learn, and almost nobody practices it before they need it.

Build the kit before you need it

Don't carry the whole roll of tape. It's heavy and the roll is mostly cardboard. Wind ten or fifteen feet around a trekking pole, a water bottle or a lighter. Wrapped flat, it's always on you and never in the way.

For sewing, you want less than most people think:

• A heavy needle. Sailmaker's or upholstery needles are thick enough to punch through pack fabric and webbing. A regular sewing needle will bend or snap on the first stitch.
• Bonded nylon thread, size 69. It's sold as upholstery or outdoor thread. Cotton thread rots and rips. Bonded nylon holds and resists abrasion.
• A thimble or a small pair of pliers. You'll need one or the other to push and pull the needle through layered fabric. Fingertips aren't built for it.
• Two or three safety pins and a few feet of cord. Pins hold a tear closed while you work. Cord is a backup when a stitch won't.
• Adhesive repair patches. Ripstop nylon patches in a small zip bag cover tents, jackets and sleeping bags. Cut them round before you leave.

Keep all of it in one small bag with a note taped inside saying what each item is for. You'll forget under stress.

Step one: stop it getting worse

Before you fix anything, stop the damage from spreading. A tear in nylon will keep running every time the fabric flexes.

Look at the ends of the rip. If you can, put a stitch or a dot of tape right at each end first. Then pull the edges together and deal with the middle. Skipping this is the number one reason a two-inch tear becomes a ten-inch one by the time you're back at camp.

Take a minute and look at what failed. A torn strap tells you the stitching gave out. A split seam usually means something was overloaded. Fix the cause, or you'll be doing this again in an hour.

Step two: clean and dry the surface

Tape and adhesive patches fail on wet, dirty fabric. Every time.

Wipe the area with a bandana or your shirt. If it's wet, dry it with whatever you've got, or give it ten minutes by the fire or in the sun. Dirt, sand and sunscreen all keep adhesive from gripping. Rubbing alcohol from the first aid kit cleans a surface in seconds and evaporates fast.

If you can't get it dry, skip the tape and sew it. Thread doesn't care about damp.

Step three: patch with tape

For a tent fly, rain jacket or sleeping bag, use a patch and not duct tape if you have one. Peel and stick, press hard and hold for thirty seconds.

When duct tape is all you've got, here's how to make it last:

1. Cut the corners round. Square corners catch on everything and peel first. Round them with scissors or tear them with your fingers.
2. Warm the tape. Hold it inside your jacket for a minute. Cold tape doesn't grab.
3. Press from the center out. Push the air out as you go. Wrinkles are where it lifts.
4. Tape both sides. On a tent or jacket, a patch inside and out holds twice as long.
5. Overlap, don't just cover. Run the tape at least an inch past the damage in every direction.

Duct tape struggles on silicone-coated nylon, which a lot of lightweight tents use. It may hold for a night or two, then slide off. If your tent has that coating, carry the proper patches.

Step four: sew what tape can't hold

Straps, seams, belt loops and anything that carries weight need stitches. Tape alone won't survive load.

Thread the needle with about three feet of thread, doubled over. Tie a knot at the end, then tie another right on top of it. It's a bulky knot and that's fine.

Push the needle through from the inside so the knot sits hidden. Make stitches about an eighth of an inch long, close together and tight. Every few stitches, go back one and sew forward again. That's a backstitch, and it locks the line so one broken stitch doesn't unzip the rest.

For a rip, use a whipstitch: through, over the edge, through again, repeating along the tear. For a strap, stitch a box with an X in the middle where the old stitching was. The X spreads the load across the whole patch.

Finish with three small stitches stacked on top of each other, then a knot, and pull it flat. If you need to tie off a cord or tighten a lashing, the six knots worth learning cover most of it.

A few quick ones

Broken tent pole: Slide a tent stake or a stick over the break and tape it tight in three or four places. Wrap long enough that it can't bend.

Stuck zipper: Pliers can squeeze the slider back down onto the teeth. Gently. Too much pressure and the slider cracks.

Boot sole peeling off: Wrap tape around the toe and sole, or lash it tight with cord. It's ugly and it works.

Leaking water bottle or hose: Dry it, wrap it tight and call it done until you're home.

Safety, and what not to fix

A needle through a fingertip is a nuisance. Push away from your body, wear the thimble and don't work with gear in your lap while it's still strapped to you.

Never field-repair anything your life depends on. That means climbing rope, harnesses, helmets, carabiners, and fuel hoses on a stove. A stitched or taped repair on those isn't a repair. Retire the gear and replace it. And if you've cut yourself, know what to do in the minutes before help arrives.

Finish it at home

A trail fix gets you out. It doesn't mean the job's done.

When you're back, peel off the tape, clean the gummy residue with rubbing alcohol and look at what actually broke. Re-sew the strap properly with fresh thread, or send it out to be done right. Replace the patch with a proper one. Put the thread, the needle and the tape back in the bag, and restock what you used.

The old rule applies here too. Leave it better than you found it, and that includes your own gear. The next time something fails, you'll be four miles out with a kit that's ready.