I love my blendtec.  I use it almost everyday for green smoothies.  I am now in need of a new jar.  The bearings on the two jars I received have been worn out and no longer work as well.  The first time I ordered my blendtec was almost 10 years ago.  I received two jars when I bought it.  One was measured at 4 cups and the other was measured at 5 cups.  I love the 5 cup jar because it makes a big difference in quantity.  My entire family drinks green smoothies every day, so it is nice to have that difference.  I LOVE this blender, but I am wondering if there are any jars that are larger?