HIGH PERFORMANCE WEIGHT PLATE BACKPACK Built for Olympic-style plates, this weighted backpack locks weight tight for rucking and bodyweight training. Secure fit stays put during push-ups, pull-ups, squats, and dipsand its great for rucking, walking, hiking, and endurance training. COMPATIBLE WITH OLYMPIC PLATES (NOT INCLUDED)Compatible with most gym plates up to 17.5" in diameter and 2.5" thick. Designed for 2-inch center hole Olympic-size weight plates found in home and commercial gymswhether cast iron or bumper style. Olympic plate carrier holds one large or multiple smaller plates, with a recommended maximum load of 45 lbs (20 kg) for safe use.