These handy double-walled tea infuser bottles are such fun to use.
There are 3 compartments.
You place your desired herbs in the smaller end compartment, then screw on the middle filter compartment.
Then fill the larger compartment with hot water, and screw on the two joined compartments containing your herbs and filter.
Then tip upside down! Leave to steep for a while, then unscrew the herb/filter part, leaving you with a perfect cup of tea to sip.
These are sturdy and just perfect for taking your tea along while you're on the go.