This is printed in clear PETG and has as big of holes as possible, but unlike desiccant holders I use in other places I probably don't need to see through see the dryer itself is often recharging the beads.

I will say there are the random beads that can fit through the hole if I shake it for a bit. So when I load it I shake out the one or two tiny outlier beads that can fit through. I thought about shrinking the holes a bit, but this size was best for my beads I think. (Orange Indicating Silica Gel Dry & Dry)