I always put them inside a box - typically an unused pen box - as I've had trouble with the bending otherwise. Good luck!how do you all ship refills? People who buy a pen often come back a few months later and buy refills - what is the best way to ship them? Thanks for your help!
When you put them between thin card stock - usps say anything non bendable goes as a parcel - I always end up paying $4-5 to ship first class- for $3 refill that’s expensive!I put them in a baggie taped between 2 pieces of thin cardboard and put in an envelope. It's cheap and easy.