Exactly my thought upon reading the thread title. Cheers!

Maybe you could weigh out your powder and put it onto little squares of waxed paper then fold it up and seal it with a piece of tape or something. I’d think that would be the way to fit it into as small of space as possible, and on the plus side is more environmentally friendly than plastic too. You could even just toss the paper in the fire in the evening if camping. ...Then crack open your camp fire beer.