sachet

plural sachets

1. A small scented cloth bag filled with fragrant material such as herbs or potpourri.
2. cookingA cheesecloth bag of herbs or spices added during cooking and then removed before serving.
3. A small, sealed packet containing a single-use quantity of any material.

   My burger arrived with a plastic sachet of tomato ketchup.

   1 more example

   In the Philippines and other parts of Southeast Asia, the problem was compounded by a new kind of plastic packaging that took flight in the 1980s — the sachet. It was a plastic pouch but often bulked up with layers of aluminum or paper for shape or durability. […] Sachets are cheap, flashy and convenient.

   2019 January 15, Christopher Joyce, “A New Weapon In The War Against Plastic Waste”, in NPR