NOT the M36 musette bag! The smaller bag on the right was my old man's who served 68-72 (both of them were his, I inherited both). I included it to compare size/color. Both are definitely originals, not Rothco knockoffs, who while during research I have found make an exact replica of my mystery bag, calling it a musette bag. It is slightly smaller than the M36 with no internal pockets or dividers, a snap closure on the rear, and a small side pocket with a snap closure. NO markings at all. It appears to be OD7, while the M36 appears to be OD3. Also the material feels quite soft and light, not the heavy canvas of the M36. Someone please help, I have been wondering for years what the green thing is.