A week and a half ago I made a v1:

Leather holster for a landing net

I took it out for two days of fishing and, while I didn’t lose my net, I didn’t like how much it twisted and flopped around.

Today I made a v2 with two important changes:

1. I used some thicker, stiffer leather. This should keep it more rigid.
2. I made the belt loop much wider. This should prevent the twisting at the top.

Cut and glued to prep for hole punching and sewing:

Stitched and being trimmed:

Oiled and on the belt!