Here's a simple record bag from UK-based Soul Jazz records. Similar in size to the Technics City bags, these zipper-top canvas bags will hold up to 25 records, have a small outside pocked, and are lined with a thin layer of rubber to keep water out.
Favorite feature: The bag was designed with a stiff bottom and small plastic feet, allowing it to stand upright when placed on the ground.
Available here in Gray, Black, and Blue from Turntable Lab for $32