We all know the Tardis is bigger on the inside and most of us would not mind storing our yarn in one when so no one can comment on how much we have, I can't help there but I can give you a great Tardis bag to keep your latest project in. I use 100% cotton fabric for the interior and exterior and I add interfacing to add structure to each bag. I use ribbon for the drawstring and add a cord lock to keep your project secure. The bag measures 12 inches tall and is 8 inches square. This is a great size for sweaters or other projects of about the same size.