I think you're missing the boat on the straps....
I get ya... I understand how they work.
Here's my issue with them, the D38 straps are open end loops that attach to the bike. There's 4 of them and each one attaches to one of the rings on the bag. That's all good.
But, my issue is if you do remove the bag, you still have 4 straps ties to the bike you have to take off or they're flopping around. It's not a big deal and many riders won't care. I just like having to deal with my 2 straps.. and to contradict myself some, one of them is a rok strap so I'm dealing with 3 straps... okay, am I sounding stupid yet.. LOL so.. I'd rather deal with 3 straps than 4.. okay fine.. you've made me look like a fool.. are you happy Kev!!!.. LOL
I could ditch the rok strap and use 2 conventional straps to hold the bag down like I have in the past with typical duffels.
I think the mounting system is cool, I just like messing with things and trying different approaches to see what works for me best.