i like this idea. you can use the top to put your tea in you wwant to use for brewing. seems like it is big enough for a full can too. maybe not all teas but i don't use more green tea for my 1.3 liter can. it's easy to measure, get a feeling of the amount and to leave it on the can like this when you start to boil your water.
https://www.instagram.com/p/CK5p4tzLBkH/ 