I didn’t realise until recently that the new style hipbelt for the Gossamer Gear Mariposa is backward compatible with my old style dyneema Mariposa. The new hipbelt has two significant advantages over the old style.
Firstly, the ends of the aluminium stays locate directly into pockets in the hipbelt. This means that the load transfer of the pack to the hipbelt is directly coupled. Additionally, the hipbelt is stiffer and has more padding, both of which should improve both the dynamics and the comfort of the hipbelt.
Secondly, the pockets are larger. In the old hipbelt, the pockets were only big enough for a small compact camera like the Sony WX100. A larger compact like the Sony RX100 was a bit of a squeeze. With larger pockets, it fits with ease. It also means a bit more space for snacks in the other pocket.
The only modification needed in the old Mariposa is to cut a couple of small holes in the channels containing the frame so they can exit the pack body and locate into the hipbelt. It was really easy. One tip is to insert (and then remove!) a pencil into the hipbelt stay pockets as they are quite tight and need to be opened up a bit. I bought my hipbelt from backpackinglight.co.uk . Bob has a useful video on how to fit the hipbelt.
I’ve not given it a full test yet, but my initial impression is that it is a signicant improvement over the old hipbelt. Here’s some pictures.