Re: Good sleeping bag for sailing
A good liner can add about 10 deg. to the bag rating as can a cover or bivy sac on the outside. Depending on what you have to sleep on, many of the previous suggestions are great. An inflatable mattress, an inexpensive man made fiber bag good to maybe 32 deg with a couple of liners (one light, one heavy) with a breathable cover should cover most situations. You can use the covers alone for warmer and add components for cooler and colder temps. It also makes cleaning much easier! If you are on a boat an additional fleece blanket will give you even more range. Just stick with man made materials.