The same tea filter bags we use at our cafe. While the manufacturer says these are for a 2-4 cup teapot we find they are perfect for 1 cup when you want to tie off the end. 

T-Sac Tea Filter Bags are single-use disposable tea infusers to steep loose leaf tea as conveniently as tea bags and without messy tea strainers. 

Set of 100 bags that are 4 x 3 x 0.5-inches and hold about 4 teaspoons. 

All-natural, chlorine free, won't change tea's flavor; single use, easy to fill, fully compostable, biodegradable, and disposable for easy cleanup.