Buttpack 1967
Tropical Rucksack - 1968. There isn't a lot of extremely detailed info on the Internet so check out the comments for some more! : r/Militariacollecting
M1967 Nylon Butt Packs and later versions - FIELD & PERSONAL GEAR SECTION - U.S. Militaria Forum
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M1967 Nylon Butt Packs and later versions - Page 4 - FIELD & PERSONAL GEAR SECTION - U.S. Militaria Forum
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M1967 Nylon Butt Packs and later versions - FIELD & PERSONAL GEAR SECTION - U.S. Militaria Forum
FIELD GEAR LOT