I do not think you can name many great inventions that have been made by married men
Imagination is more important than knowledge.
How would this work?
Haven’t seen inside one, but it probably uses a spring as counterweight. It may be a standard resistance, or it could be adjustable. It works a bit like an elevator; adding weight starts to lower it until it reaches equilibrium. Your movement will raise and lower the frame on your back, but the spring-loaded suspension keeps the pack at about the same height.
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