Snugpak SF1 and SF2 fit together into this compression bag (just the SF2 alone of course too) and both easily into a Snugpak dry bag 35 litres that's a bit larger.
But you also can put the drybag into the compression bag, afterwards the sleeping bags, squeeze out the air and close the drybag afterwards.
I assume that this works also with Carintia Defence 4 alone or Defence 4 and Tropen.
The Snugpak dry bags are relatively good.
You nevertheless should check if also an Ortlieb Drybag PS 10 or other Ortlieb dry bag would work for you, because their quality is better. The Ortlieb dry bags are by far the best ones that I know.