Re: I'm a wrapping n00b...
If you are looking to do just basic rick sack type carriers, and other similar back carries, likely a size 4 (3.6m - sorry my math is bad and I suck at conversions) would be the ideal size. You could get a away with a 5 (4.2m) as well. Any longer would be overkill I think. I am 5'1", 130lbs, and VERY busty, and a size 5 is my go to size for almost everything. Super long tails in a ruck, but not long enough to trip over.
Cristina, Mama to Michael 03-16-06 , Nathan 01-16-11, and an angel 01-20-09
Go with your gut, follow your heart.