I love my
Moment lenses, but they can be bulky to carry around. Moment makes some carry products, but I wanted something I could strap to my bag, clip to my belt, and very quickly swap at least three lenses in and out, plus have somewhere to park my lens cap.
This quick mount has the same mounts that are on your phone case, so the lenses twist right in. I've made them pretty tight/secure/deep so they'll stay on, and I've never had a lens fall off. It includes slots running through the backplane so you can feed velcro ties through them and around your bag strap or belt, and is curved a little to fit most bag straps better. (Though might not be too curvy on your belt, it works). The Velcro ties I use are these ones:
https://www.amazon.com/VELCRO-Brand-Reusable-Fastening-Organizing/dp/B001E1Y5O6
NOTES:I have designed this to fit / use two of the larger lenses (58mm zoom and Wide) + one smaller lens (superfish). But it seems to work fine with really any combination of the five+ different lenses moment sells. The lens cap holder accommodates both the small and large caps (but not the Animorphic). This version is a litttle tight at first, so be gentle twisting your lenses in, but the plastic will wear down a little after you use it a bit so it's just snug and confidently secure. I would recommend that you keep the same lenses in the same positions. You'll probably do this anyways for convenience/habit but I find the Moment lenses all differ a little in their mount tolerances, so the holder will eventually wear down to best fit those specific lenses.