Not that many will get the chance to sleep on a Royal Australian Navy submarine, this might be the closest you can get.

These military surplus "Submariners" Sleeping bagsmade with a100% cotton shelland would make an ideal insert for a swag.

A generous 1840mm (6') x740mm (2'5") with a zip down both sides and a built in pillow case these are quite luxurious for a military sleeping bag.

Shell: 100% cotton - with "Frecotex" Flame retardent
Fill: 100% polyester

NSN: 8465-66-073-0615