It is especially useful to cushion the occasional heel blister. It's for splinting poles which are damaged during a trip. Resist the temptation to leave it home. It doesn't weigh much and is worth its weight in gold when needed. I carried it for years and finally actually needed it on Isle Royale National Park, halfway through a 50 mile backpack.
Blue jeans Resist the urge to wear or carry blue jeans.
Though they provide comforting warmth when the temperatures dip, and though their hardiness resists thorns and rock edges and the like, they are absolutely worthless when wet and take forever to dry. They are also very heavy to tote when wet. A first aid kit is carried by everyone. Its always better to be prepared than be unprepared and sorry. Use color-coded stuff sacks and develop the habit of always packing the backpack the same way.