HI @Philreedshikes !
I use the Osprey Airporter LZ, https://www.rei.com/product/887945/osprey-airporter-lz-pack-duffel-small, Small, which fits bags larger than advertised. I've used it up to a 60L backpack with room to spare. It folds up nice and small so it's easy to store in the backpack once you arrive at your destination.
one or more gifts or other benefits from the co-op.