I took a run up today to visit inmate traveltoad, taking him up on his gracious invitation to see some Kriega gear. He has a ton of it & it doesn't sit in the closet either--that stuff is used!!!
Initial interest was the R20 backpack, but after sifting through the pile, I believe the US20/10 will be the better choice.
So. Question: I see that a combo is listed at a minimal cost saving. It seems from the description that the US10 does not come with the mounting straps, but must be attached to either the US 20 or the US20 mounting straps. If that is true, I'll gladly pay the extra $3 & get the mounting straps for both bags.
You have a good ambassador for Kriega gear out here on the west coast in traveltoad. He has the gear & knows how to use it.