I use large diameter straws like the ones found at mcdonalds. Fold over one end and seal with a bic lighter. Then, using a homemade paper funnel pour in the amount of spice you want to carry, cut off the unused length of straw leaving enough to fold over and seal. Use just enough heat to start to melt the plastic and pinch closed with my fingers. Be careful though, if you heat the plastic too much it can stick to your fingers and blister them. To use the contents, cut off the end and pour what you need and reseal. Thats it! simple, small and lightweight. Oh, BTW you can use a marker to label the contents on the straw.
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Enjoy your next trip...