New study finds nylon tea bags leech billions of microplastics into every single cup of tea. Kirkland brand teas appear to be nylon, correct?

Correct. The box says it is a nylon tea bag. Likely it is food grade nylon. Which you can look up online. Please note the proper brewing temperature is 80C. I would not worry unless you are putting the teabag into water and then boiling it. If you are using boiling water, you are ruining the flavor anyway. Also, the "new study" you cite is from 2006. Personally, I'd worry more about the 30-40 years it takes for the bag to decompose. You have to cut the teabag open and take out the spent tea to compost it. (Which my plants love, by the way).

What material is the tea bag made of?

The bag IS NOT regular tea bag material --- it is nylon.

is there caffiene in kirkland green tea (itoen)?

It is my understanding that green tea has 1/3 the caffiene of coffee. An 8oz cup of green tea has ~ 25 mg of caffiene.

How much l-theanine is in one cup of tea?

There is no info on the packaging for this brand.

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🍃 Elevate your daily grind with Japan’s finest matcha blend!

ENERGIZE YOUR DAY - High caffeine content delivers a natural, sustained energy lift without the crash.
PURE JAPANESE EXCELLENCE - Savor the authentic, vibrant flavor of 100% Ito En matcha leaves sourced directly from Japan.
HEALTH FORWARD VEGETARIAN - 100% vegetarian, antioxidant-rich green tea to support your wellness goals.
CONVENIENT SINGLE SERVE BAGS - 100 individually packed tea bags for effortless brewing anytime, anywhere.
BULK VALUE WITH PREMIUM QUALITY - Generous 481g pack size ensures you never run out of your daily matcha ritual.

Kirkland Signature Ito En Matcha Blend offers 100 high-caffeine tea bags made from 100% authentic Japanese green tea leaves. Packaged in a convenient bulk size of 481g, this vegetarian-friendly tea delivers a premium, energizing experience perfect for health-conscious professionals seeking a refined daily boost.

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Weight	481 g
Volume	0.15 Kilograms
Brand	KIRKLAND
Storage Instructions	Keep Dry
Item package quantity	1
Form	Tea Bags with Daylight, Teabags
Caffeine Content	high_caffeine
Serving Recommendation	1 Tea Bag
Package Information	Bag
Additives	Green Tea
Item model number	SYNCHKG018176
Net Quantity	100 Count
Product Dimensions	34.29 x 15.24 x 10.16 cm; 481 g

Kirkland Signature Ito En Matcha Blend - 100 percent Japanese Green Tea Leaves - 100 T

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