I was just messing around with this idea - Hamilton Beach blender and various jars. Mason jar and many others don't fit, but a Polar fruit jar and another no-label jar do. So I did some measuring, and if I'm not off, the 2-3/8" (outer edges) fit, but the 2-1/2" didn't. So I think mason jars must be typically 2-1/2" and that's maybe what you should look for in a blender. I think the biggest advantage to jar vs. the blender container is if you'd like to store several things (or just more than one) at a time. Bonus info: I put in two huge frozen strawberries (that's all I had in the freezer), a little sugar and some milk to just cover the berries and ended up with awesome ice cream. Added a little more milk and had an excellent smoothie. A little yogurt instead of milk - frozen yogurt in about 5 minutes! In a take-along jar! It's all good.ðŸ‘🻠Edit: uline site, this mason jar is 2-1/2". So either my jars are the wrong kind (I used spaghetti sauce mason jars) or I'm measuring incorrectly. https://www.uline.com/Product/Detail/S-17491/Jars/Canning-Jars-16-oz?pricode=WZ495&gadtype=pla&id=S-17491Q3&gclid=Cj0KEQjwt6fHBRDtm9O8xPPHq4gBEiQAdxotvCKa9Q2I49TM2TTrpkrvs3yOUiNAXrKOC39_wmorek4aAq3K8P8HAQ&gclsrc=aw.ds