Get a modern style light-weight plate carrier. Most of them are about 3 pounds or less now. A PC will have better weight distribution and gear securement over a chest rig or vest. They're only big enough to cover your vital organs instead of a huge body oven style like the CAGE or Intercepter. High Ground, Cyclone, JPC, First Spear, etc, are all good types. Replica PCs come in two varieties; over expensive and cheaply made. If you're on a budget pick up a Cyclone or a 5.11, even a Tactical Tailor can be pretty inexpensive. Most will have open or mesh and flexible sides for breathability and lighter weight. You can carry a 3 liter water bladder and a bunch of mags well distributed, and if it's adjusted right it'll sit on you securely and comfortably, and it won't drag down like a vest or webbing.
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BC & YUKON MASTER AV REPRESENTITIVE