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Ok, so end to end it would function exactly like the stretcher, flat.

What about the side to side profile, if not U shaped then what?

Two questions,

When you lay in a bridge hammock,

does it lay flat head to toe?

is the side to side profile a U shape?

Never tried one, but it would be easy to get a feel for the concept before buying,

http://www.operationalmedicine.org/TextbookFiles/FMST_20008/Block 4/1423a/image014.jpg