This is a sc/ch fabric where you sc into the sc of the row before last, enclosing the ch of the previous row. You never sc into a ch, always into the sc of the row before last, always enclosing the ch. The chain stitch keeps the single crochet from stretching out of shape.
|Blue and Red Bag Stitch pouch|
- (2 rounds blue, 2 rounds red) 3 times, then
- 3 rounds blue, then
- (3 rounds, 1 round, 3 rounds) of red/blue, then blue/red, then red/blue in the middle, then
- mirroring the beginning pattern of 2 rounds of each color, and
- topping off the pouch with alternating rounds of blue and red -- which ends up making vertical stripes.
|Bag Stitch Pouch with closure|
That is a nice bit of color work, with each round using only one color - remarkably brainless for as fancy as it looks. You can see the round beginning/end jog especially well in the top bit.
Once the flat envelope pouch was done, I added a zipper going in the opposite direction, added I-cord loop at the bottom of the zipper (top of the photo), and another I-cord at the top of the zipper, joined to the zipper pull (left side of the photo). When the pouch is zipped closed, the long I-cord strand folds to slip through the smaller I-cord loop to cinch up the top and make a handle/strap -- a fairly classic pouch shape. And there was nothing in the bag to make it hold its shape in this picture.
Here is a diagram of the stitch in rows. Starting at the bottom left corner, the diagram shows a starting row of ch10, sc in 4th ch from hook. Note the ch-2 turning chain for each row.
It can be tricky to see the chain stitches in round 2 when you want to sc into the skipped foundation chain. It is possible to start with a foundation row of (sc, ch1), but that needs thinking, too: The sample picture below shows 12 patt sts across, then rotated, continued along the bottom back to the start (12 more patt sts), rotated again to continue in a coil, and making 7 patt sts in the new row working into the 'skipped ch' (which looks a lot like the body of a dc lying sideways in foundation stitch).
|Sample of foundation bag stitch|