richpips
What size dry bags are they?
Does the front move about much wi just one strap on it?
What’s in them?
And re the rear one how do you manage to keep it up for so long?
13l on the front of mine, all the others are 8l.
Surprisingly stable, though you could add another shorter strap to the headtube if you were caning it over big stuff.
Bivvybag and sleeping bag up front, clothes behind.
The rear I used 3 straps which all needed to be tight. Really fiddly to get it right. Since then I’ve gone back to a conventional seatbag: more weight empty, stable, and quick to get things in and out of it.