Not a pocket item.  It is so large in fact, that it can accommodate one large rigid glasses case and nothing else.  They will tend to thump around by themselves..Of course, if you put peripherals in with designer sunglasses the sunglasses will loose.  So think rigid case within a not so rigid case.  The zipper and multiple items is not a recipe for one hand operation.  The belt loop clip on the end is sturdy, resilient, and large but not exactly quick release.  The emergency snap for the belt loop is probably superfluous.  If you actually do intend to crawl through hatches, crevasses, fox holes and machinery it will snag immediately and often.  .If there is a chance that you will need some item, a G.P.S. for instance, in order to come out alive; then put it in something else that is appropriately certified by OSHA or NATO, etc., for air assault, mountain climbing, spelunking, etc.  For everything else this stuff qualifies as tough.

When using the belt loop, mount it snap, loop and zipper up. This keeps gravity on your side when you open it.  The strap is rough, which transfers stress to seam away from the snap to the seam.  It is a modified M.O.L.L.E.("Molly") system.  When using the clip, you will naturally pick up the POD first before unzipping it.  If accidentally unsnapped the loop acts like a lump and the POD starts to flop around and you can re-snap it.