First off, get the biggest hook you can find. I think this is a size P 15
Ok now triple up on the yarn, "worsted"
Start out with Ch. 3
Row1: Sc in first Chain 8 times slip stitch to 2nd chain.
Row2: Ch 1, 2 Sc in each Sc
Row3: Ch 1, 2 Sc in first Sc 1 Sc in second continue with 2 stitches on every other Sc
Row4: Ch 1, 1 Sc in first Sc, 2 Sc in second, *1 Sc in each of next two Sc's then 2 Sc in next stitch* continue ** ending with 1 sc in last stitch before slip stitch into ch. 1
Row5: Ch 1, 1 Sc in first two Sc's, *2 Sc's in next Sc, 1 Sc in next 3 Sc's* continue ** ending with 1 Sc in last stitch before slip stitch to ch 1
Row6: Ch1, 1 Sc in first 3 Sc's, *2 Sc's in next Sc, 1 Sc in next 4 Sc's* continue ** ending with 1 Sc in last stitch before slip stitch to ch 1
You can continue in this pattern till you get the size that you want or just stop here like I did and go up...
After you have reached the size you want simply stop adding and crochet in each Sc around til you get the bag as tall as you would like.
Be creative with the strap and there ya go...I plan on buying a canvas strap for mine and just sewing it together in a loop after weaving it through the bag. Any questions please ask!!