FAQ -"Can I walk about easily with this on my back or will I be bent over double?"  
 
RAD Paramotors - FAQ
Well, we developed light weight units for exactly this reason.

I don't know many people given the choice between carrying, running and landing with 18Kg or 35Kg on their back that would choose the latter. That's why we put so much developing powerful units with light weight being our number 1 objective.

It's also interesting to note that all aircraft manufacturers, including Boeing and Airbus, spend millions of pounds every year trying to save weight. Why? because the more weight you carry, the more lift you need to produce, which in turn creates more drag.
  "Just how heavy are your paramotors?"
"How strong is the cage?"
"Can I walk about easily with this on my back or will I be bent over double?"
"Will they have the power to get me off the ground?"