Found the perfect case/bag for your Sub2000. Not expensive, not tactical and fits perfectly. Larswon Sling Bag, Lightweight Large Chest Bag Laptop Backpack Shoulder Bag for Men Women Black https://www.amazon.com/dp/B07M8NX8WJ/ref=cm_sw_r_em_api_glt_i_JGXWP698NR0X7BG8H3CD?_encoding=UTF8&psc=1
Looks like a nice option @SueNommi thanks for sharing.
Probably belongs in this thread.