Four legs

Hiking poles give me two extra legs. They are most useful going downhill, over uneven or wet terrain. I bring them wherever I hike, especially when I travel, because I use a collapsible set from Black Diamond that folds up to less than 14 inches (36 cm). That not only fits in carry-on luggage, it will also hide away in a day pack, so I can take them out only when needed. The $75 Distance Z-Poles are lightweight aluminum, unfold in a second, and are very rigid. You can get featherweight carbon fiber if you want to pay more. — KK