The infuser is great and quite large. However, do not feel compelled to fill it up with the loose tea. A small teaspoon of loose tea will serve you very well (depending on the flavor of your choice). When finished steeping your tea, you'll need to find a place to set the lid and infuser (this can be a bit messy if you are traveling). Additionally, once you remove the lid, it is an open cup without a travel lid, so be extra careful not to spill it.