Originally Posted By: Glock-A-Roo
I've had this happen with VitaLyte (the artist formerly known as GookinAid) that was stored in my car kit. I thought the sugar had gummed up from the heat, but maybe not. Was your drink powder stored near any heat?

Yes! It was a 1 kilo jar of Vitalyte that I've had for a couple years. But it was stored in a cool, dry cupboard this whole time so I don't think heat was an issue. I also opened a quart envelope of Vitalyte powder that was bought at the same time and stored in the same place and it was fine, so I can only assume that something went wrong with the factory seal on the kilo jar. Therefore the clumping seemed like a moisture issue to me.