On the look out for some Kreiga tail bags for a pal of mine .... I believe he's after a US30 and two U20 bags or Just a US20 with some U10s.... if that makes sense !
I have a US30 used once at last years tt,I'm not sure where I've put the bike loops though I'll have a dig around tomorrow and get back to you.
Get a US20 and 2x US10's and you are spot on. Great stuff and great quality. Use the loops of the US20 under the tail seat and secure in place. I am pretty sure you can find instructions on Kriega website.