In Japan these are popular in hotels. Rather getting an instant packet of coffee, they have these in the room. It's a all in filter coffee, just careful and pour water in slowly but it works.
https://www.thecoffeepod.co.uk/cont...cQvzD6cXYsRWkh4NueZmmYmyrnnFI2qxoCvE0QAvD_BwE
Thanks for the link, really useful as I'm looking to get for a week long camping trip