Free: Contests & Raffles.
The 3000 bag is so light and straps down so small I don't know that you would gain much going smaller ? But the 3000 is a little small for more than an overnight so maybe the 1600 for days and a larger for extended would be the ticket.
I use a mystery ranch nice frame. I personally use the metcalf bag but they make other bags or you could get the load sling and attach any bag you want over that.For durability and load hauling ability there's not much that equals it.I've heard of the kuiu frames breaking under heavy loads , but cant say I've witnessed it.
Went with the Kuiu icon pro 1850