Always tie in by threading the rope through both your leg and waist loops. Regardless of what outing you choose, a belay loop is a handy extra that is worth the additional money. Haul loops Many harnesses come with a haul loop, which is a loop of webbing sewn at the back of the waist belt. It is useful for clipping on trail ropes, approach shoes, or chalk bags. Some are runner strength, some aren't, so be wary about how much trust you put on this point.
Gear loops Harnesses vary in the placement and number of gear loops they offer.
Choose a model with enough gear loops to comfortably accomodate your rack, but not so many that they become cumbersome. While this is handy for carrying lots of gear on an aid climb, it can obstruct a quick grab for gear on a difficult free climb. But if you like to keep your gear on your waist, you'll want four. I prefer to have extra loops because even if I'm not using them for carrying gear, I can tie a light jacket through one of the rear loops or clip a water bottle there. Loops vary in size and location on the waistbelt.