Rocket Fuel Casing
Go to Your Local Grocery Store (one That Has Veggie Bags)
Go to your store and look for any cardboard canasters from the veggie bags. If you don't see any ask an associate if there are any in back. Last ask a worker if it is fine to take em home.
Most will say yes but better safe than sorry.
Use It
The second photo is not mine it is off Google images