Cut some squares of aluminum foil (2"x2") and use a square for each anther. Lay the anther on the foil to dry for a day or two. Then fold the foil up like an envelope and label the back. I use sharpie for this. Put them all into one jar, preferably with a desiccant packet included. If you can't find silica gel desiccant, you can use horticultural sand from a garden center. Either should be dried in the oven first (250 deg.). A couple of tablespoons of dried sand or silica gel gathered together on a piece of cloth tied with a string should work great.
THEN DO WHAT I DIDN'T DO LAST YEAR: MAKE A RECORD OF WHAT POLLENS YOU HAVE IN THE JAR!!!
Put jar in freezer.