Whether you buy the biggest size available or find bulk bins near you, getting spices in bulk will save on your plastic usage.
Spices and tea are the only bulk bins that are easily available to me. However, they are extremely overpriced. But whenever I can, I will go that route.
But in the meantime, even buying in the biggest size available will reduce your plastic even if you’re still buying plastic.
There’s less plastic in a huge container than many smaller plastic containers that make the same amount.