We aren't coffee drinkers, but we are tea people. We brought a
collapsible kettle, collapsible travel mugs, three kinds of tea (including two loose-leaf with measuring spoons and strainers etc.) and of course the sugar/spices/add-ins we enjoy in small containers that resealed well - e.g. the sugar always goes in an old Talenti gelato tub because it's the right size and seals nicely, the mulling spices go in an empty cinnamon shaker, etc. All of it went into our checked bag with no problems. Then got a small thing of milk from
Amazon Fresh when we got our snack delivery.