I still like my very old, late '70's Kelty Tioga pack. Made in the USA, excellent frame, straps and waistbelt and metal hardware. Very light and very convenient to pack. I am going to use it in a week or two for a short backpacking trip.

You can find the old Kelty's on eBay often for pretty cheap. Usually someone that stashed it for decades and finally decides to sell it. I see almost pristine ones on there occasionally.
There are newer models that are also well made but not as well made as the old USA Kelty's from the 70's and 80's.