I made one too but using a panthyhose (tights for you I think), it’s great and before that I used to waste so much corn starch. What I did was cut the foot off a new pantyhose and filled it with cornstarch, then made a knot and left a bit for a “handle”. When it’s running low I just undo the knot and fill it back up.
Your site is great, thank you so much for sharing all your experience!