I used this once to store hot coffee. The inside of the thermos retains a slight coffee aroma. There is almost no aroma on the inner stopper, inner cup, and outer cup. If you were to use it for barley tea, I don't think you'd notice. - Brand: Zojirushi - Model: SF-CC20-XA - Capacity: 2.0L (large capacity) - Material: Stainless steel - Accessories: Strap - Retail Price: 6,358 yen Thank you for looking.