Manosteel
WKR
I have never used the duplex frame but have extensively used the bikini frame with T1 bag. Last year I packed out a deboned sheep, a bull elk Two trips, a moose for me and a helped a couple of buddies on theirs. Every load with an animal was in excess of 100lbs and the BT1 combo did its job better than any other pack I have used to that point (cables frame types, various badlands and other comparables).
Where the bikini shinned in my eyes is that in daypack mode it was super comfortable, so much so I often forgot I was wearing it. I have been caught unexpectedly on the side of a mountain before, not fun, and now always bring my day hunt stuff plus my sleeping bag/pad/bivy (about 3lbs) with me anytime I head out from camp.
I have also recently purchased the high camp 7k bag for it and like how easy it is to swap bags.
Where the bikini shinned in my eyes is that in daypack mode it was super comfortable, so much so I often forgot I was wearing it. I have been caught unexpectedly on the side of a mountain before, not fun, and now always bring my day hunt stuff plus my sleeping bag/pad/bivy (about 3lbs) with me anytime I head out from camp.
I have also recently purchased the high camp 7k bag for it and like how easy it is to swap bags.