Air France bags are good, reinforced with a foldover top with plastic-ish strips so it stays folded. BA bags are kinda floppy, not that confidence-inspiring... and none of them are large enough! I like the idea of the amazon ones.

For my next trip I've actually bought a pack of sealable nappy bags to place filled airsick bags in, because it's always a problem to figure out what to do with the full one while trying to find and open a new one for the next bout!

(Yes, I get airsick a lot. Got new meds for next trip though, which I'm very hopeful about. Haven't travelled for a couple of years now, because it's not fair to me or the other passengers!)