I start most of my seeds for tomatoes and peppers and other plant in those cell trays and need markers to remind myself what is planted in each tray. I have used Popsicle sticks and bought the plastic sticks in packages but came across a tip on a YouTube site video that sounded like a better solution. Old Vinyl Blinds
I took my old ones apart and wound up with 75 slats. I cut them into lengths that I needed and had a total of 370 plant sticks. The nice thing is you can customize them to your needs. I cut some longer, some shorter and some skinnier.
Write on them with a magic marker and re-use each year.
I can't wait to get started. Hope this helps.