I wondered what knitting pins were, as I had never heard of them. I looked at your picture, & then I knew. They were always called stitch holders years ago, when I knitted.
I still use the biggest rings I can find & put my little zip baggies on it, as most of my projects have a gazillion colors. I only have to open the ring when I first put the baggie on it.

Proves the old adage: Necessity is the Mother of Invention!

Marydenmark, you are a very resourceful woman! Pam