That's frustrating, I keep mine in an airtight container, pressure sealed. You can buy them in almost any size. They keep out, moisture, sunlight, air and preserve the powder well. I use Human grade which is usually pretty expensive so I definitely don't want to waste it. But I hear ya on the Deca, 50 grams is a lot to throw away, I wasted 50 grams trying to make a test base injectable in oil that was stable..i guess i didn't really waste it though, injectable didn't hold stable so I just drank it lol