I got my packs off of Amazon, I put them in ammo cans and also seal one in with M14 parts I put in 4 mil ziplok type parts bags. It's cheap enough to get the real thing.
m14brian
Amazon.com: SOHLER 5 Gram Pack of 50 Silica Gel Desiccant Packets Drying Agent Moisture Absorber Dehumidifiers (Ship from USA): Home & Kitchen
m14brian
Amazon.com: SOHLER 5 Gram Pack of 50 Silica Gel Desiccant Packets Drying Agent Moisture Absorber Dehumidifiers (Ship from USA): Home & Kitchen