Why not? The pressure in the 20# tank is the same as the one pound tank.
Hey, you can carry your gas around in a balloon too if you want but it's
never gonna' be the right tool... But go ahead, use balloons to store
your flammables, keep them right in your kids bedrooms if you want...
Who said anything about a vessel that is not meant to be filled with
propane? The one pound tank IS designed to carry propane. There is the
difference between your delightful analogy, a balloon is NOT made to
carry propane.
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The law says you can not transport if refilled. I refill the small bottles
all the time. They are good for multiple refills. If I get a leaker, so
what. I leave it outside and toss the canister later. At the price of the
little bottles, it is really a large saving. Last year in Sequoia Nat'l
park, I saw the bottles for $14 /each.