Are vacuum storage bags any good ne where can I get some?

[Chumhum]

My futility room is in need of a tidy and I have a huge pile of duvets and pillow that need to be stored. I've seen vacuum storage bags advertised somewhere, but I'm not sure if they're any good. Anyone know?

The JML ones are great. I have tried others but they reinflated.
I would rebuy JML.

I have Lakeland ones - they're excellent. I get the ones which have a zip-up outer layer too, as it makes them easier to stack.