We recommend basing the size selection on the width measurements below compared to your upper body build but we have found that most exchanged the first round from a standard to a large size if they were on the fence.
Don't overthink it, we've found that the Standard RPC will work best for most people.
Sizes (Ruck Plate Pocket is the same on all sizes with the straps being the only difference)
Small
Strap Length - 15.9"
Strap Width - 2.4"
Best for those that are ~5'2 or shorter
Standard
Strap Length - 16.8"
Strap Width - 2.8"
Best for those that use the 20L Rucker and are average size or build
Large
Strap Length - 18.7"
Strap Width - 2.8"
Best for those that are over 6' with larger torsos and upper body
Attached is a screenshot for reference as well.
