So after countless hours messing around with this animation, I could not get my head around it. It was meant to be the aim for 45 seconds, but I am leaving it at 10 because it's been exceedingly difficult- I may revisit this task when I have more time on my hands but for now, I can't look at this flour sack any more. Making it move how I want it to is really difficult, but despite this, I am happy with how it turned out- there are 120 frames in here so the process has taught me A LOT about problem-solving and 2D animation.