Cooke Custom Sewing
Not the lowest cost and probably an ounce or two heavier than some but feature rich and very well made and made in the USA.
Dan's products evolved from the needs of folks who do extended remote treks, mainly Canadian tundra canoe trips, which accounts for his tolerance of an extra couple ounces for the sake of durability.
Oh ... order early, he operates in the "first come, first served" principle and occassionally has large orders in the queue.
If you decide to make your own, thru-hiker is a good materials source.