It is a good combination. I like it. I think it’s better cold on a hot day without any sugar or milk.
The bag may be biodegradable but don’t put it in your compost because it doesn’t degrade in time to for that. Maybe if you were to collect them and for a while and then boil them without any tea leaves for long enough they would start to biodegrade but I only saw that once for a biodegradable plastic bag on youtube.