I've used one of two different style belts when in the field with my pack. As others have mentioned, the Marsupial Gear belt is good. It's best features are the ability to quickly undue and its slight bit of stretch. The other belt I used before getting the Marsupial belt—and still utilize—is a riggers belt I found at an army surplus store. It's not the style riggers belt with a giant cobra-style buckle in the front or more of a tool belt style riggers belt. It's got simple hardware and belt tension is held via a cam lock and the belt tag end fastens back on itself via Velcro. Honestly I sill prefer the hold of that riggers belt over the Marsupial one when packing heavy, either during approach or especially when packing out quarters. I have had the Marsupial one slip or come slightly unbuckled during those heavy load times with a lot of stress on the hips and vertical pressure. It is, however, more comfortable and convenient. Anything in those veins is better than some traditional belt with big buckles and doubled-up leather on the tag end under a pack waistbelt really cinched down. In any case, highly advise compatibility with all pants you may wear in the field. These style belts can be pretty wide, and one of my pairs of hunting pants I use for warmer weather hunts is a struggle to feed through some loops initially, but once in place it's a nonissue.