Silica gel dessicant packs (Allendale Park, Oakland)

Dozens of small ones (~1/2" sq to 1x2") from various supplements. I use them in jars of all kinds of food items - especially things that have a tendency to "cake" like bulk powdered supplements. They help keep rice and other grains fresh.

You can "reactivate" them by putting them on a baking sheet in an oven/toaster oven really low (75-90°C) for 10-15 min.

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