My favorite bags I've had are from Mystery Ranch, but they're from before the Yeti acquisition, and I haven't tried any since, so I don't know how quality has held up. I do know they've eliminated a ton of their catalog.

I still have two Dana Designs packs I purchased in the mid-90s. They're going strong and supremely comfortable (one daypack, one backpacking pack).

Mystery Ranch is still doing pretty well for themselves. (I'm amused knowing that they crank out harnesses for Amazon employees left and right for their robot safety systems.)

I'm also a Red Oxx guy. Love my Sky Train backpack when I'm flying out. They quote a "no bull" warranty, and their CEO suggests to "be sure to include them in your will."

https://www.redoxx.com/products/sky-train-convertible-backpa...