Ordered 50 and used right away. Have tried Glassine, which is good as a barrier paper and I like it's semi-transparency, but is so slippery that every time a storage drawer was opened, the paintings would slide around threatening to crumple the edges. Legion Interleaving so far does not slide like this and as well fits the same size Kozo sheets use perfectly. It is also a useful paper in other ways, for example wrapping inside a tube to send or to use to protect clean paper on a suspicious surface...etc. I have Interleaving paper like this that is decades old and still like new so have confidence it is archival.