30kg is a lot of weight to carry, not saying you can't just that seems a lot.
The photo of the set up of bags, is that a tent bag sideways behind the saddle ? go for a test ride and see how stable it is or if it works loose a bit while riding.
If it's a tent, you could velcro tape the poles to the main frame tube (down or top tube or seat tube if long enough) the actual tent should squash down into a smaller drybag which could be lashed to the frame elsewhere.
Failing that maybe look at lashing the black bag underneath the saddle bag, keep it inline, be better areos and more stable than the current set up.
Sounds like an ace adventure you have coming up :)
30kg is a lot of weight to carry, not saying you can't just that seems a lot.
The photo of the set up of bags, is that a tent bag sideways behind the saddle ? go for a test ride and see how stable it is or if it works loose a bit while riding.
If it's a tent, you could velcro tape the poles to the main frame tube (down or top tube or seat tube if long enough) the actual tent should squash down into a smaller drybag which could be lashed to the frame elsewhere.
Failing that maybe look at lashing the black bag underneath the saddle bag, keep it inline, be better areos and more stable than the current set up.
Sounds like an ace adventure you have coming up :)