A lot of our packs and other gear has a lot of webbing straps going on, as does most of human made load carrying gear in general. These keepers exist to keep those straps all neat and tidy. The 50 mm keepers are great for 40 and 45 mm webbing too, just so you know. For straps that you keep adjusting back and forth you can either use these to just keep the end of the webbing going where you want it, instead of rolling it up into a bundle. And if you do roll it into a bundle you have two options: to attach the bundle to the rest of the webbing or to let it hang on its own. The latter means you are free to easily adjust the strap/buckle as the webbing bundle is not kept captive on the rest of the strap. These can be used for a lot of other stuff too, like bundling up pens and cords etc.
