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Deepcut said:
Zip lock bags are one of the items we always take down. Small, much cheaper here, light, and pick your favorite brand. Also a few large trash bags (because we only need 5-8 for 2 weeks).

Exactly...takes almost no space, you don't buy a box of way more than you use. We bring the 13 gal kitchen bags for the galley, small plastic bags that grocery stores use (I know, not everywhere these days) for the head. these are bigger than a gallon ziplock, just twist and tie. And big black yard bags to combine an keep in a hold (forward hatch on a cat)