Ah nice!
I just took photos of my Poncho roll compared to an original works well but obviously the same limitations that 58" gear has.
The poncho roll easily contains 2 US ponchos with pegs paracord bungees etc.
Here showing the size and design difference, buckles rather than those tuck and pin things, minus the entrenching tool holder, and longer straps, and two straps wrap around the belt lt rather than the thing hanging from it.
and this shows the width etc, it works well it's about 2" taken off both sides.
I made it to fit in with an older pouch set, yours looks nicer though