Training Weight Vests are designed to hold one plate in the front and one plate in the back pocket. Both pockets are compatible with our 10lb, 20lb, and 30lb Standard plates only. The 45lb and Long plates will not fit. We strongly recommend using equal weight in the front and back pockets of the vest.
Ruck Plates are sold individually and separately from the Training Weight Vest. Check them out here: https://www.goruck.com/collections/ruck-plates
However, we have found that most other brands of weight plates will fit, but for reference the largest plate that will fit in our vest pockets is 9" x 11.5" x 1.38".