Glass laboratory jars, Reagent Bottles flat top small neck for Spices or chemists.
2.1 50 NZ$2.10 - NZ$50.00
Mostly, the smaller ones are bought for spices, but larger ones can have sesame seeds kept in them. Some Chinese even use the very big ones for soaking herbs. The ground glass in the top and the ground glass on the bottle surface makes for a very airtight and vermin and insect proof seal.
Whether as a gift as is, or all filled up creatively, this could be considered for Xmas.