Hi Brad! Tupperware or a big mason jar will be fine, but you're going to need mason jars down the road anyway.

As for the rope; sorry 'bout that! The easiest way for me is to cut it with a cigar guillotine cutter into thin coins, then rub it out. If you don't have one handy, let me know; I should have put one of my extras in the bag just in case.