I have the OG 2k and 6k, and I purchased the new frame with the 3k 5k and 8k...I have since dumped the 5k and the newer frame. I have packed 1 bull and it's extremely comfortable. I have used the older frame and the 6k most extensively in the high country, Pannier is the only way to go with IA packs. I feel in love with it....BUT, the mass migration to IA from KIFARU after Aron left and the rumored ( not USA made anymore on the newer stuff ) none of the new bags have the made in the USA tags and several posted failures above, I had to try something else and moved to SG. Exo is on deck when the k4x is released. IA is a hell of a pack that IMO inching towards jumping the shark with influencers. IF it's not made in USA anymore but not being announced, that's a real problem for me.