There’s nothing at all wrong with training using the same backpack used for backpacking under the load expected on typical trips, but it can be more convenient to use something like the Go Ruck setup. To keep a backpacking pack, like my ULA Circuit, always ready for use with appropriate weight would require either keeping my normal gear in the pack, or using some sort of substitute, which would alter the way it carries. ?Definitely possible but not as easy as just grabbing my GoRuck.
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The form factor of the GoRuck is also much smaller and less odd looking when walking around the city, which is a consideration for some people. Unless someone knows what the pack is, they have no idea of the weight. The Go Ruck is purpose built for properly carrying weight in a compact form. You could not just put a 30 pound plate in a ULA Circuit and have it carry well. ?
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Anyway, it boils down to personal preference, convenience, and appearance. And I think I walk under load a lot more because I have it. For example, after a big pre Super Bowl meal yesterday, I decided on the spur of the moment to grab my GoRuck and walk for four miles before kickoff. I know I wouldn’t have done that with my circuit because it would not have even been with me. I carry the GoRuck almost every day as a regular backpack in the colder months when I won’t sweat much while wearing it.
ravi_jmt2013