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Fourside Jar


When it came out, the FourSide jar set new trends in commercial blending. It was only natural that it became a hit with consumers around the world.

FourSide Jar is rated 4.5 out of 5 by 88.



3 years



  • BPA-free FourSide jar
  • Vented Latching lid

The Original Square Jar

The FourSide jar effectively harnesses the power of your Blendtec blender. Its blunt safety blade is thicker and stronger than other blades. It is made from impact-resistant, BPA-free copolyester and is compatible with all Blendtec consumer blenders.

Better Blends

The FourSide jar’s square shape blends much better than traditional round jars. The jar also generates more friction, heating soups and hot drinks quickly and easily. It’s also especially good for grinding grains and making smaller quantities.


  • Capacity: 75 oz with measurements up to 32 oz
  • Jar Dimensions: 5.37'' wide x 9'' tall x 5.37'' deep; 3.88'' wide/deep just above the base
  • Shipping Dimensions: 7'' wide x 9.5'' tall x 7'' deep
  • Weight: 1.5 lbs
  • 3 year warranty


Rated 3 out of 5 by from 5 stars for base, 0 stars for jar I've had my old K-tec Champ since 1996. It runs beautifully and makes short work of almonds, spinach, berries and anything else I put in my smoothies. However, my 4th jar just bit the dust. The first jar lasted for several years, but I didn't use it as much then. The last three have lasted for about 2-3 years each. This one is just over 3 years old. I don't want to spend the money for a VIta-mix when i have a base that works so well, but this jar issue is ridiculous. I'm going to just start using the warranty at 2 years and 11 months even if the jar isn't show problems yet. BLENDTEC - YOU HAVE TO FIX THE BEARING ISSUE ON THE JARS!!!
Date published: 2017-10-18
Rated 4 out of 5 by from Excellent Blender, Poor Bottom Gasket I love this blender, but am put off by the poor life of the container given that after about 300 cycles the blade does not spin freely. I clean and maintain it regularly, so I feel cheated. I clean it even better than the manual suggests so this shouldn't be happening. I am the only user, so there is no way somebody could be tampering with it or abusing it without my knowledge. It would be great if this blender had a kit to change the gasket at the bottom. THIS WOULD SET THIS PROBLEM TO REST AND LOCK IT IN AS A '10'. I don't think the competition does this. Nudge! Nudge!
Date published: 2015-10-30
Rated 3 out of 5 by from Works great, but not for long I've been using these for over 10 years and blend about 4 times a week on average. The contents range from yogurt and fruit smoothies to heavier items like meat and vegetables. We only fill the jars to about 24 - 30 ounces and get absolutely perfect results every time with only a single blending cycle (50 seconds). However, they only last about 1-1/2 years before the seal fails and the blade doesn't turn easily. Always slightly past the 1 year warranty, of course! But as long as the blender keeps working I guess we'll keep buying the jars.
Date published: 2015-05-04
Rated 5 out of 5 by from Love the Four Side Jar! I bought my Blendtec with the Wildside Jar on sale at Costco last year and, while I have loved the operation of the blender, sturdiness and ease of cleaning, the bigger jar wasn't designated for some of the recipes and smaller amounts I wanted to use. Since getting the Four Side jar, I find I use it all the time with all the recipes I want!
Date published: 2014-07-30
Rated 4 out of 5 by from Liked old lid better I had to get a replacement blender jar as the old one started to leak after 600 uses. When i got the new jar, i noticed the lid is not completely closed and it comes apart in two pieces. This is harder to clean this way. The jar handle also is not solid its hollow so stuff can get stuck on inside of it. Im noticing the blades just are not fully blending frozen bananas in smoothies n i have to pulse it a few times after the cycle is done.
Date published: 2014-09-05
Rated 4 out of 5 by from great jar, less than great lid I just bought a new jar -- the old one was leaking after 6-7 years (thanks for the great product!). It's very lucky that my old lid is as good as new (thanks for the great product!), because it's so easy to scrape the smoothie goodness off it with a scraper, unlike from the newly-designed lid. The latter has narrow and curved rut, which requires a small, narrow object to do the job. I don't have such an object; a tea spoon doesn't do a good enough job. I tried the new lid a couple times but eventually shelved it in frustration. I wonder if other folks give similar feedback and if BT would consider going back to the old design in future iterations.
Date published: 2019-02-24
Rated 5 out of 5 by from Great upgrade of original container I've used Blendtec blenders for the past 10 years or so, and while I always liked the fourside jar, I was unhappy with both the container material and the bearings of the blade. This new container fixes both problems. The material is a clear and doesn't seem as vulnerable to etching as the original containers. The blade assembly and bearings are amazing -- quiet, sturdy, and apparently so well designed the jar comes with a 3-year warranty, or longer if you're buying it as part of a blender purchase. This is the last thing that might have kept me from recommending the Blendtec blender to everyone. I'm completely satisfied with the way it works and looks.
Date published: 2019-03-18
Rated 5 out of 5 by from JAR WAS WORTH ORDERING I bought this second jar replacement. The first replacement I had purchased was a for gasket issue. It had just worn out, which they do. At that time I could see little gray bits when grinding sugar to powdered sugar and called Blendtec. So it was time to replace. This current replacement jar was due to making soup with super 'hot off the stove' vegetables and broth. Liquid started to leak and thankfully didn't damage the base. Although I did melt the gasket. Sooo... this time I know to be more careful and save my receipt for the longer 3 year warranty. Yes, it is worth it as I love the features of the base I already have.
Date published: 2017-01-23
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Is this Jar suitable for a 2009 blendtec Serial # 14599

Asked by: Socorro
All of our jars will fit all of our machines.
Answered by: Blendtec Catherine
Date published: 2019-02-10

Why does the bottom rubber seal keeps leaking after a year? I may be switching to Vitamix even though I like Blendtec's design and functions. Is Blendtec going to come out with a newer model with better rubber seal?

Asked by: GerryM
Blendtec has come with a new design for the jar. You can check the warranty of your machine at jar when you call customer service at 800-748-5400.
Answered by: Blendtec Catherine
Date published: 2019-01-12

Is there a kit for replacing the bearings in the mechanism in the jar. The jar holds up but the mechanism does not.

Asked by: PamG
There is not a kit for replacing the bearings or the blade. Call customer service at 800-748-5400. You will need your serial number (from the bottom of the machine) as well as the engraved number on the bottom of the jar. They can check for warranty. If under warranty, they can replace the jar.
Answered by: Blendtec Catherine
Date published: 2018-07-16

I need a jar for my blender model Es3 EZ blender serial EZB36913.  Please let me know which one is compatible.  Thank you

Asked by: Trisha chung
Hi, contact the dealer that you purchased your commercial blender through. They should be able to help you with the purchase of a new jar.
Answered by: Blendtec Catherine
Date published: 2017-10-20

I need a replacement jar for my blendtec. The model of the jar is 40-505 and the blendtec model # is ES3 total blender black. I purchased the blendtec @ Costco.

Asked by: Charles M
Please call customer service at 800-748-5400. You will need the serial number of the blender (found on the bottom of the machine) and the number engraved on the bottom of the jar. They will help you with a replacement.
Answered by: Blendtec Catherine
Date published: 2017-07-28

how do i know this matches my base model CTB2?

Asked by: sarahfoxvi
All of our jars with fit on all of our motor base
Answered by: Blendtec Catherine
Date published: 2017-07-17

Hi blendtec ! I want to replace the jar of my " ES3 Total Blender". But, it is not clear that the FourSide jar meet " ES3 Total Blender". Is the FourSide jar compatible with Blendtec blender model " ES3 Total Blender" ?

Asked by: Ilovecat
Yes, all of our jars will fit all the home blenders. ES3 Total Blender is residential so you will have no problems.
Answered by: Cherrera
Date published: 2017-06-05

what is the warranty on this jar?

Asked by: melaneeo
The jars come with a 3 year warranty.
Answered by: Cherrera
Date published: 2017-03-14
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