This is a great little
This is a great little upgrade. In the rucker you can put a plate in the big pocket and partially fill this with sand so you can incrementally increase the weight you are carrying. Let's say you are currently rucking 20Lbs and the next plate up from it is 30Lbs. That 10 Lbs jump representa an increase of 50%. With this you can carry your 20Lbs plate and add 1lb of sand. Then another etc so you can work your way to 30 lbs. Once at 30Lbs you can repeat the process to 40lbs etc.
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