I think what you had there was the Ecotat shelter.
It was sold to the public but was also an issue item for Special Forces. Marine recon issued it as a set which consisted of the shelter with accessories, a lightweight sleeping bag and extreme cold bag, all in an earth brown color. The bags were made by Wiggys. The set was officially called the Multi Purpose Poncho System (MPPS).
Pretty versatile piece of gear. I have a a few complete systems and separate bags that I will dig out of my bunker and put up for sale here if there is interest.