The mason jar – gotta love it for carrying coffee, tea, ice-water – you name it.  Since it’s glass, a mason jar is non-reactive (unlike plastic water bottles).  The screw-top lid keeps drinks from spilling in the car/in my backpack. And they’re super convenient (I’ve got stacks of them in my cupboards).
I used to tie a dishtowel around my jar to catch condensation (on iced drinks) or help insulate (hot drinks). I figured a knitted cozy would work much better than a towel, and, yes, there are knitted jar cozies you can purchase online.  But buying one would take all the fun out of working out a pattern myself and doing some stash-busting/saving some pennies at the same time!
I wanted the cozy to 1) be made of wool to wick water and insulate well, 2) fit snugly, so it wouldn’t slouch and slump down, and 3)have a handle for carrying or attaching to a carabiner.
So, here’s the finished pattern to share with you (In two sizes – quart wide-mouth, and pint wide-mouth)! You know the drill -please, don’t reproduce the pattern or use it for profit without my express permission, but feel free to knit oodles for yourself and as gifts (they are quick to make, taking less than a day!).
Larksong’s MASON JAR COZY PATTERN
copyright 2010 by Angela Baker
For the Quart Jar: Brown Sheep Lamb’s Pride Worsted, content: 85% wool, 15% mohair; 190yd/173m per 113g skein; Color: Aqua Waves; #: half a skein or less
Set of US #6/4.0mm double-point needles
Quart wide-mouthed canning jar
Tapestry needle
2 stitch holders
Gauge
19 sts/30 rows = 4 inches stockinette stitch before blocking
Pattern
For the Quart Jar (with optional handle)
CO 8 sts Divide amongst 3 needles
Join sts, being careful not to twist.
Base –
Round 1- (k1, kfb) repeat around. You will have 12 sts.
Round 2- (knit 2, kfb) repeat around. 16 sts.
Round 3 and all subsequent odd rounds – k around.
Round 4- (knit 3, kfb) repeat- 20 sts.
Round 6- (knit 4, kfb) repeat- 24 sts.
Round 8- (knit 5, kfb) repeat- 28 sts.
Round 10 (knit 6, kfb) repeat- 32 sts.
Round 12 (knit 7, kfb) repeat- 36 sts.
Round 14 (knit 8, kfb) repeat- 40 sts.
Round 16: (knit 9, kfb) repeat. 44 sts
Round 18: (knit 10, kfb) repeat, 48 sts
Round 20: (knit 11, kfb) repeat, 52 sts
Body and Neck–
knit around for 30 rounds
[If you want to add a handle – Divide for handle starting here –
work in (k2,p2) rib all around, on sts 21-26 k1fb of each st, placing each increased st (the one knit into the back) on a stitch holder to the inside of the work. (You will have 6 sts on a stitch holder).
Continue in k2, p2 pattern, repeating the increase/stitch holder portion for sts 47-52 (putting 6 more sts on a 2nd stitch holder.).
You should now have the original 52 sts on double points, and 6 sts on each of two stitch holders.
(k2, p2) repeat for 7 more rounds (8 rounds total)]
(If you do NOT want a handle, simply (k2,p2) repeat for 8 rounds instead.)
K around for 4 rounds
Loosely BO.
Optional Handles –
With two dpns, work 6 stitches (from one holder) in I-cord for ten inches.
K1, k2tog, k2 tog, k1 (4 sts)
CO and weave in ends.
Repeat with 6 sts on other holder.
Finishing
If making a handle – tie ends of I-cords together in a knot to form the handle.
Block finished cozy on the jar (taking care, Lamb’s Pride felts easily.)
Materials:
For the Pint Jar: Scraps of any heavy worsted weight wool yarn – a great way to showcase small skeins of handspun! – about 70 yds total.
MC: Lamb’s Pride Worsted. Content: 85% wool, 15% mohair; 190yd/173m per 113g skein; Color: Winter Blue
CC: any handspun or remnants of any (Pint shows some spindle-spun 100% merino)
# set(s) US #6/4.0mm double-point needles
Pint wide-mouthed canning jar
Tapestry needle
2 stitch holders
Gauge
19 sts/30 rows = 4 inches in stockinette stitch before blocking
Pattern
For the Pint Jar (with optional handle)
With MC, CO 8 sts Divide amongst 3 needles
Join sts, being careful not to twist.
Base –
Round 1- (k1, kfb) repeat around. You will have12 sts.
Round 2- (knit 2, kfb) repeat around. 16 sts.
Round 3 and all subsequent odd rounds – k around.
Round 4- (knit 3, kfb) repeat- 20 sts.
Round 6- (knit 4, kfb) repeat- 24 sts.
Round 8- (knit 5, kfb) repeat- 28 sts.
Round 10 (knit 6, kfb) repeat- 32 sts.
Round 12 (knit 7, kfb) repeat- 36 sts.
Round 14 (knit 8, kfb) repeat- 40 sts.
Round 16: (knit 9, kfb) repeat. 44 sts
Round 18: (knit 10, kfb) repeat, 48 sts
Body and Neck–
knit around for 12 rounds
[If you want to add a handle – Divide for handle starting here –
With CC, work in (k2,p2) rib all around, on st 21-26 k1fb of each st, placing each increased st (the one knit into the back) on a stitch holder to the inside of the work. (You will have 6 sts on a stitch holder).
Continue in k2, p2 pattern, repeating the increase/stitch holder portion for st 47-52 (putting 6 more sts on a 2nd stitch holder.).
You should now have the original 48 sts on double points, and 6 sts on each of two stitch holders.
(k2, p2) repeat for 7 more rounds (8 rounds total of ribbing)]
(If you do NOT want a handle, simply (k2,p2) repeat for 8 rounds instead.)
K around for 4 rounds
Loosely BO.
Optional Handles –
With two dpns in CC, work 6 stitches (from one holder) in I-cord for ten inches.
K1, k2tog, k2 tog, k1 (4 sts)
CO and weave in ends.
Repeat with 6 sts on other holder.
Finishing
If making a handle – tie ends of I-cords together in a knot to form the handle.
Block finished cozy on the jar (taking care, Lamb’s Pride felts easily.)