Duct tape is a backpacking essential and one of the most multi-functional backpacking hacks around. It can tape the sole of your boot back on, patch a hole in your tent, double as a heavy-duty bandage if you get a blister or help make a splint in an emergency. Duct tape should win an award for its many uses in the backcountry, but as useful as it is, don't bring the whole roll. To keep your duct tape lightweight, wrap it around your water bottle. This will ensure that you'll have it wherever you go and it will cut out the extra weight of the cardboard roll.