So, for Justine, and not only, my bag stitch pattern.
Note: very easy
This stitch pattern requires multiple of 5 stitches + 2 extra stitches (border stitches, i.e. one st for each side). I won't mention the border stitches in the pattern.
Row1 (RS): Knit till end of row
Rows 2-4 : Knit till end of row
Row 5: *[yo twice, K], repeat from * till end of row
Row 6: *[Slip 5 sts purlwise to RH needle, dropping same time the yo's from previous row; slip these 5 sts back to the LH needle and Ktbl, do not drop the stitch from LH needle, (yo, Ktbl) twice in the same stitch. Now pass(dropp) all the 5 sts to the RH needle.] Repeat from * till end of row. Now you should have the same no of sts on yr needle.
Repeat rows 1-6
For the swatch in the above picture, I casted on 32 sts (30 sts + 2 border sts). If you still have questions regarding this stitsch pattern, pls let me know.