I completed this just the other day. The bag itself probably took me about a week or something. (I don't really remember... whoops). But the straps and rings took about a week and a half to come in the mail.
I started this bag following a pattern but decided to freestyle it when I finished the bottom. Its pretty simple and only requires you to know a few terms.
Here's the pattern:
Abbreviations:
mr= magic ring
st= stitch
sc= single crochet
dc= double crochet
Color A:
Make a magic ring, chain 1, single crochet 6
Round 1: 2 sc in each st around
Round 2: *2 sc in next st, 1 sc in next st. repeat from * around
Round 3: *2 sc in next st, 1 sc in each of the next 2 st. repeat from * around
Round 4: *2 sc in next st, 1 sc in each of the next 3 st. repeat from * around
Round 5: *2 sc in next st, 1 sc in each of the next 4 st. repeat from * around
Round 6: * 2 sc in next st, 1 sc in each of the next 5 st. repeat from * around
Round 7: * 2 sc in next st, 1 sc in each of the next 6 st. repeat from * around
Round 8: *2 sc in next st, 1 sc in each of the next 7 st. repeat from * around
Round 9: *2 sc in next st, 1 sc in each of the next 8 st. repeat from * around
Round 10: *2 sc in next st, 1 sc in each of the next 9 st. repeat from * around
Round 11: *2 sc in next st, 1 sc in each of the next 10 st. repeat from * around
Round 12: *2 sc in next st, 1 sc in each of the next 11 st. repeat from * around
Round 13: *2 sc in next st, 1 sc in each of the next 12 st. repeat from * around
Round 14: *2 sc in next st, 1 sc in each of the next 13 st. repeat from * around
Round 15: *2 sc in next st, 1 sc in each of the next 14 st. repeat from * around
Round 16: *2 sc in next st, 1 sc in each of the next in next 15 st. repeat from * around
Round 17: *2 sc in next st, 1 sc in each of the next 16 st. repeat from * around
Round 18: *2 sc in next st, 1 sc in each of the next 17 st. repeat from * around
Round 19: *2 sc in next st, 1 sc in each of the next 18 st. repeat from * around
Round 20: *2 sc in next st, 1 sc in each of the next 19 st. repeat from * around
Round 21: *2 sc in next st, 1 sc in each of the next 20 st. repeat from * around
Round 22: chain 2, dc in each st around, join
Round 23: chain 1, sc in each st around, join
Round 24-34: repeat rounds 22 and 23
Round 35: chain 2, dc in each st around, join.
Fasten off and connect with color B to the last slip stitch and continue with the pattern.
Round 36-49: repeat rounds 22 and 23
Round 50: chain 1, sc in each st around, join
Fasten off, weave in ends.
When attaching the rings, clip them onto the second Round of dc from the top. I have three dc in the rings to ensure that they will not mess up the stitching. Try to make the straps as evenly far apart on either side.
If you try this, let me know and if you have any problems, I would be happy to help!