Swedish lambs wool baby sack

B's mom sent us this beautiful lambswool baby sack which she used when B and his two siblings were babies.  I had never seen a baby sack like this before she sent it to us, but B and I are planning on using it for Batman once she is born.  The only problem is I'm not 100% sure how it can/should be used.  Is it like a moses basket?  Should it be used as a travel bed?  Can it be used in lieu of a bassinet?  Any advice on how exactly this baby sack should be used is much appreciated!

Isn't it beautiful?

The sack when it is open

The sack when it is closed