Mason Bottle

Imperfect-Mason Bottle Silicone Sleeve 4oz

18 reviews
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These sleeves are perfectly imperfect! Each 4oz sleeve has a minor imperfection as seen in the image. The imperfection is a small bump of silicone that does not affect the integrity or use of the sleeve in any way and is strictly aesthetic. 

NOTE: Due to the discounted nature of this item, this product will be FINAL SALE and our regular return, refund and replacement policy will not apply.


  • One AESTHETICALLY IMPERFECT Silicone Sleeve in 4 oz size

1 4oz Silicone Sleeve

- Fits regular-mouth 4 oz mason jar
- Dual-purpose window shows bottle contents and assists in putting sleeve on jar
- Imprinted measurements displays approximate volume markings in both ounces and milliliters
- Helps children and adults grip the bottle to prevent drops
- Dishwasher-safe
- BPA, BPS, phthalate and toxin free

100% Satisfaction Guarantee

With most brands, if your baby doesn't take the nipple, there's no returning the bottle. But at Mason Bottle, we never want parents to have to worry about this. 

We are the only bottle brand where you can return any product, at any time, for any reason.


Customer Reviews
4.7 Based on 18 Reviews
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  • silicone sleeves
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Aspen F.
United States

Sleeve works fine

This was fine for our needs so far. We wanted to travel with some frozen milk & know that glass is more brittle when frozen. Milk traveled fine & stayed frozen in our insulated cooler bag!

Kristi E.
United States United States

Love this product

I purchased two of the 4 oz silicone sleeves in green. They fit the jars really well and are easy to clean.

Dawn R.
United States United States


It was easy to order. Shipping didn’t take forever! This order is for my daughter, she is due in June! Thank you!!

Leanda U.

Gives a good grip and is perfect for my mason jars that don’t have the ounce increments on the side.

Erika S.

Love these sleeves. I love that I could first use these small jars as her bottles. Then when she transitioned to a larger size, we have used them for her food. And when that's done, we'll use them for other things in the house. Same with her big bottles. We can send food to school in them when the time comes. Love it.