I just purchased this new jar for my Blendtec.  My last jar is almost worn out.  The new jar seems to have a hard time fitting, but it eventually goes into place.  I love my Blentec and use it everyday and multiple times a day. We are trying to eat healthier.  I went to the Blentec website and found a LOT of great smoothie and soup recipes, each different one makes it easier to choose healthier choices.