My Knitted Mason Jar Cozy

My two mason jar cozies, as knitted by yours truly.

As I mentioned yesterday, I needed a cozy for my mason jar in order to use it to drink hot beverages, since hot liquid + glass = burned fingers.  It’s also darn handy for cold beverages, as the cozy helps control condensation.  There’s tons of options for jar cozies.  At the no-work end of a spectrum, a standard commercial beer cozy will accommodate a pint jar, or you could lop off the end of a lone crew sock and use the ribbing.  The crafty-inclined, though, relish the opportunity to try their hand at making one.

Since I can knit and have those supplies on hand, I chose to knit some cozies rather than sew some up, though I find the sewn ones to be completely adorable.  To do so, I relied on a free pattern from Miso Crafty Knits.  I did have a couple problem areas, though.  In the ribbed patterns, I seemed to have a little trouble with maintaining an even tension, which is usually not a problem for me at all.  Once the cozy got on the jar and the stitches stretched, I could see how my ribs were a little crooked.  I also found that the cozies liked to slide around on the jar a little bit, and tended to slouch over time.  I remedied that on the ‘convertible’ cozy, which is the colorful one in the photo, by sliding an elastic hair tie under the fold over.  That worked wonderfully, so I made another (the red one) where I sewed the elastic directly into the top band.  This cozy stays firmly on the jar, and looks pretty cute!  The following pattern, then, is my variation on Miso’s for the sewn elastic band.  Each one took me maybe two and a half hours to make.

You’ll need:

  • 3.75mm (US5) double pointed needles or a circular needle long enough for Magic Loop
  • Approximately 45 grams worsted weight yarn.  (Note:  Miso recommends 30 grams of DK weight yarn.  However, I found that the thicker yarn is more insulating and helps to camouflage tension troubles, which can occur on double pointed needles.)
  • Stitch marker (optional)

Size:

To fit pint (16 oz or 500mL) jars

Gauge:
5.5 sts = 1 inch

  1. Cast on 40 stitches using the long-tail cast on method.  Place the stitch marker for beginning of round and join in the round, being careful not to twist your work.
  2. Purl in the round (garter stitch) for approximately 1 inch.
  3. Switch to knit in the round (stockinette) and knit approximately 4 more inches, or until the piece measures about 5 inches.
  4. Purl 1 round.
  5. To finish the cozy bottom, knit 8 stitches, knit two together, and repeat this pattern until the end of the round (36 stitches).
  6. Knit 1 round.
  7. Knit 7 stitches, knit two together, and repeat this pattern until the end of the round (32 stitches).
  8. Knit 1 round.
  9. Knit 6 stitches, knit two together, and repeat this pattern until the end of the round (28 stitches).
  10. Knit 1 round.
  11. Knit 5 stitches, knit two together, and repeat this pattern until the end of the round (24 stitches).
  12. NOTE:  Miso’s pattern has you knit another round at this point.  I think this makes the bottom a touch big, so I leave this out.  If you want to do Miso’s…knit 1 round.  If you want mine, proceed to #13.
  13. Knit 4 stitches, knit two together, and repeat this pattern until the end of the round (20 stitches).
  14. Knit 3 stitches, knit two together, and repeat this pattern until the end of the round (16 stitches).
  15. Knit 2 stitches, knit two together, and repeat this pattern until the end of the round (12 stitches).
  16. Break yarn, leaving a tail long enough to thread through the remaining 12 stitches.  Weave it through, pull tight, and weave in the ends.
  17. Turn the cozy inside out, and slip it onto an empty mason jar.
  18. Take an elastic hair tie that will slip around the jar without breaking, and slip it onto the top part of the jar and cozy, just a couple of stitches before the purled part turns into the knit part.
  19. Take a length of yarn and thread it onto a tapestry needle, then fold the top part of the purled section over the elastic and sew the top edge of the piece to the last line of purl stitching, using the bump loops as stitch guides.  You will not poke the tapestry needle through the cozy.  Sew around the entire cozy to secure the elastic into the top cozy edge.  Weave in the ends, turn the cozy right side out, put it back on the jar, and enjoy!
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3 thoughts on “My Knitted Mason Jar Cozy

  1. You are rad. I bought a too large cuppow and the kids ruined the packaging, so no returning. Now I need to get the smaller one, because I need a travel mug and I have a ton of mason jars too.

    • Cuppows are totally awesome. I’ve also been using their BNTO cup for packing lunches.

      You know, I think I have a standard mouth Cuppow around, and I pretty much just use the wide mouth. Want to trade?

  2. Pingback: Mason Jar Koozies No 2 -Knitted Mason Jar Koozie Flat Knitting - Knitting Story

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