Dry used tea leaves. I recommend using tea or tea blends that have 'tea leaves' in them (try to avoid fruity herbal blends if they have more fruits than leaves)
Prepare a tea filter bag and the dried loose leaf teas
Carefully pour the dried tea into the filter bag
Fold and staple the closure!
Store the tea bag in the fridge / wooden drawer/closet/shoe storage/car or any humid space