I have done it with both a coyote brown 2016 k2 frame and then a 2017 ranger green frame. I added about a 4x6 piece of Velcro and I use the lower should straps off the duplex belt and then use the k2 lower shoulder straps as “X” shaped cross cross straps up to the upper horizontal k2 straps if that makes sense. I then made a custom bag and lid out of olive green XPac x42 waterproof fabric with ranger green side pockets etc. turned out great. I have ladder locks towards the bottom to use the duplex delta straps as well. That pack bag and lid may be for sale soon as I am working on a few new designs. I may sell my modified ranger green small belt too. The problem with the kuiu bags is that they are extremely un-waterproof!!