Authenticity question: Bedroll Sling

[Trinity]

I am a great fan of Spaghetti westerns but take the props and costumes with a grain of salt.  While watching Deadwood, season II a few weeks ago, I noticed some extras carrying bedroll slings, something that I've seen an many Spaghettis but have never seen anywhere else.  I did a quick search and found only one person making them at the following address. 

http://www.dellsleatherworks.com/BedrollSling.htm

Could somebody please help and shed some light on this and tell me if this is simply a movie prop or a real item.  If it is real, I'm thinking that maybe I'm using the wrong term in my searches.

Attached are some pictures (showing two different styles) that I cut out of Deadwood and blew up a little.

Thanks for your help!

[Lone Gunman]

I noticed some of the items at Dells Leatherworks have a "Historical Citation" link. While there isn't one for the sling you posted there is one for an Officers Bed Roll Sling.  The oddest one, while cited as a ball bat sling, looks more to me like a carrier for an invisible weinerdog 

[Trinity]

Slings originally called a tumpline, were a common method of carrying the bedroll documented from the French and Indian war of 1750's on. They no doubt were available before that time but to verify at least during the Revolutionary War see Collectors Illustrated Encyclopedia of the American Revolution by Geo. Neumann and Frank Kravic, page 170.

Perfect!  I'm able to find plenty of links with that.  Are there many readers out there that use these outside of military use?

Thanks very much!

I noticed some of the items at Dells Leatherworks have a "Historical Citation" link. While there isn't one for the sling you posted there is one for an Officers Bed Roll Sling.  The oddest one, while cited as a ball bat sling, looks more to me like a carrier for an invisible weinerdog 

[saul]

Poor foke might use hemp rope with two beckys at each end.

[Pawnee Bill]

 The Shiller Hartly and Grahm catalog of 1864 avalible from Dover showes overcaot slings that are similar but made from silk cord.
Cheers
Pawnee Bill