Likely from mid-1980’s commercial item (catalog here: http://soldiersystems.net/2017/02/21/lowe-vector-catalog/). Design eventually became standard issue CFP-90 although this earlier one had a better build quality (source: http://oefoif.forumotion.net/t8059-lowe-vector-i-woodland-camo-rucksack). Fabric is like a green dominant ERDL (smaller print than real M81 woodland) and is similar to ALICE pack material, like SADF Niemoller Vest.
No date codes on any plastic buckles:
Could be from 1984 – 1985 (source: http://survival-knife-184.com/sheath/sheath.html).