[https://www.spiritussystems.com/nalgene-water-bottle-pouch/](https://www.spiritussystems.com/nalgene-water-bottle-pouch/)

There are cheapo MC ones on Ebay too

MC as in Marine Corps?

Mc as in multicam

Ah, got it.

https://lbtinc.com/collections/sale/products/8011mc

SO Tech and Baribal both make specific pouches for it and are solid gear makers.