It's actually one of the, admittedly non-binding, rules of the US flag that it not be printed on something disposable. Yet after 9/11 a bunch of newspapers printed full broadsheet sized US flags for people to display. If there's anything more disposable than newsprint, I don't know what it is.

Of course, this, combined with the fact that the proper way to dispose of a US flag is by burning it, raises the question of whether nylon flags are appropriate.