Search results for mountaineering backpacking are below:

https://www.mysteryranch.com/ or http://kletterwerks.com/

Mystery Ranch is built on a heritage of function, comfort, quality and durability. Since 2000, Mystery Ranch has been manufacturing packs and load carriage systems for military, hunting, wildland fire and mountaineering customers, with a focus on use-specific designs and hand-built quality. Based in Bozeman, Montana, Mystery Ranch is a global brand with worldwide production and distribution. -Kletterworks - Mystery Ranch

◊ Note-> Only some of products are USA made.