A new Dick's just opened in my neck of the woods. From what I observed in the camping section, I would say it's not the best place to look for backpacking gear. Especially for a youngster.

Look at online stores such as REI.com. Not necessarily even to buy but just to see what's out there.

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If you only travel on sunny days you will never reach your destination.*

* May not apply at certain latitudes in Canada and elsewhere.