RRV, a little outdated but still an amazing design for a rig. Also holds plates if need be. and completely adjustable to fit anyone. theres like 5 different ways you can wear it as as well. With back, with no back, with front bib folded down, with side straps threaded through back like plate carrier. ect. light weight and breathes really well especially with no back.
Good manufacturers are Eagle industries, FLYYE, and Pantac.
http://shop.ehobbyasia.com/flyye-rrv...econ-vest.html
http://shop.ehobbyasia.com/flyye-mbs...ack-plate.html
Really low profile. hugs your body well,good for lying down