I found this website that is really nice with some great info on sewing some of your own gear. I really like this site because it's both simple, clear, minimal advertising via sponsors, and the item patterns are a little less common to see at the fabric store.
I really like the simple pattern generator on this products page:
These bags are almost identical in design to the cinch bags NASA uses on the international space station!
Learn MYOG
Learn to Make Your Own Gear (MYOG). DIY sewing patterns for backpacks, technical apparel, and outdoor adventurers.
learnmyog.com
I really like the simple pattern generator on this products page:
Learn MYOG Cinch Sack
Learn to Make Your Own Gear (MYOG). Sewing patterns and tutorials for outdoor adventurers.
learnmyog.com
These bags are almost identical in design to the cinch bags NASA uses on the international space station!