What you'll need:
2 piece of patterned fabric measuring at least 20 inches long and 10-15 inches wide
2 inside pieces of fabric measuring at least 20 inches long and 10-15 inches wide
1 zipper measuring 24inches
Pin the zipper onto the right side of the outside color fabric (mine is the flower fabric)
Sew it up.
Next add the inside fabric to the opposite sides of the zippers.(do both sides of the zipper) I found laying it out like this worked best:
add batting to the wrong side of the fabric
sew around the top and the side with the zipper again.
Pin right sides together and sew the two remaining open ends. Turn right side out. You're finished!
UPDATED: I decided when I woke up this morning that adding elastic (or even ribbon) to tie the sleeping bag closed would be cute... So I added some:Turn sleeping bag wrong side out. Un-stitch if you have to to add elastic bands (making sure you loop then) or ribbon pieces to the now inside of the sleeping bag and sew back closed
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Original blogger: obsessivelystitching.blogspot.com