From the Frontier wholesale site:

Storing Spices & Seasonings

A spice jar over the stove might be handy, but because herbs and spices deteriorate when exposed to heat, light, and moisture, it’s not a good place to keep them.

The best storage temperature for herbs and spices is one that is fairly constant and below 70° F. This means you need to stock them away from the furnace, stove, and the heat of the sun. Temperature fluctuations can cause condensation, and eventually mold, so if you store spices in the freezer or refrigerator, return them promptly after use.

A good storage system keeps herbs and spices dry and in the dark, too. Amber glass jars with airtight lids are ideal. You might also keep them in a cupboard or drawer, cover the jars with large opaque labels, or use a curtain to cover them when not in use.

In a nutshell, store your herbs and spices in clean, airtight containers, away from heat and light, and handle them thoughtfully.

I ordered a bunch of the 4 oz amber glass jars and sifters, but realized after I received the jars that the sifters don't fit.  Apparently, there are NO sifters for the amber jars, only for the CLEAR jars.

This is strange.

I like to have the frequently used spices HANDY, not in a drawer.   And while I like cayenne pepper, I don't like it enough to add OUNZES to my food.  Will order some clear jars next time.