Handling Lineup Cards

[REFANDUMP]

I've been umpiring a long time, but have never found a way to handle my lineup cards that I'm comfortable with. I usually end up stuffing them in my pockets and when I need to make a change, it's frustrating to write on them and I feel like I'm causing a human rain delay whenever I'm making a change. I've seen different types of card holders, and am wondering if you have used these with success, and if you keep them in your shirt pocket or a ball bag. I'd appreciate any advice on this.

Thanks.