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I had a vision the other day where refilling your backpacks air support system with helium was the norm, just like resupplying fuel and food while on the trail. Why has this not been done? It would work in the right application to lighten your load so to speak…right? What are your thoughts. If this hasn't been trademarked yet I call dibs!
1 gram of mass requires one liter of helium to lift it. A 25 pound pack is 11,363 grams. A 11,363 liter pack will be a bit awkward.
Had no idea it took that much helium to lift such a minuscule amount. Is there another gas that could be used for this application that would work?
Unobtainium.
Is that found on the same isle as pixie dust?
Right next to rocking horse manure.
Hydrogen is twice as light as helium–easier to get as well. Down side…it is a bit explosive. All in fun
If you can just hike a little faster, around 8km/s, you will reach orbital velocity at the surface of the earth. Then you'll be weightless. You will need to ignore air resistance and Tipi Walter's whining about fastpackers.
If you stick to hiking abandoned railroad lines, you might be able to build a magnetic levitation system into the pack.
and have access to electricity for recharging… 
You know what weights a lot less than helium? Nothing. The pack would technically be lighter if you sucked all the air out of it and vacuum sealed it than if you filled it with helium.
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