Trekking poles are a boon for security on sketchy terrain, and they'll keep your knees alive over hard-charging decades of hiking. To get the most benefit on flats, uphills and downhills, use adjustable-length poles and adjust them correctly. Here's how.
This method is popular with ultralight thru-hikers and requires two materials that you don't normally carry (cord and carabiner). Like all bag hangs, it can be foiled by smart, food-conditioned bruins. Check regulations to make sure bag hangs are legal.