Larger versions exist for large kettles. Leaves are easily discarded. Also, leaves dry fast in it. This make it possible to leave it for a day and then just discard then-dry leaves. The tea circulate freely in water.
Larger versions exist that hold more water.
A modified version that would work like a mug would be better. The leaves are compressed and air bubbles may form inside. Works in mugs or kettles. Hard to fill with leaves when wet. The leaves can be tricky to get out.