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.

 

 

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