I bought an REI FLASH Insulated mattress and a Sea to Summit 20 L. inflator dry bag. Yeah, It’s large for 3 season camping but all my clothes go into it including my down sweater.
I just roll the top down until I’ve got everything inside compressed then buckle the dry bag off. In camp my clothes stay inside the tent when I use the bag for mattress inflation then the clothes go back into the bag.

