Or take less gear, but dont forget your pole rigs ?
First outing with my new (to me) Rive 25. The 2 black trays are the supplied Rive ones (one on the seat base, one on the stacker base, which slides into the void under the seat).
The silver trays are either Tubertini (from my old, originally red topped, conti box) or early Rive (that I bought from a guy in Upton on Severn). The all fit together just fine. The sliding catches are visually different, but the pins line up exactly the same, so I'm reusing my trays just fine.
My old Conti box had octoplus, I ended up selling most of it on eBay (made a tidy sum), which I then spent on Preston gear, which fits the 25mm diameter legs of the new box. (Octoplus is 16mm I think).
To be fair, I'm not convinced! The contibox setup was pretty light, and I took what octoplus I needed. (rarely a footplate for example). The Rive, it's all there, and it weighs a tonne! Ironically, the guy I bought it from sold it because he was getting a Matrix setup, and he said that is eve heavier.
I've finally come to terms that I need to buy a barrow for those longer treks.