Germany Didymos Wraps are available from Kangaroo Korner in two sizes.
 

Didymos Size

Length in Meters

Length in Feet

Your Size

Size 6

4.7

15.5

Will allow people up to size 12 to wear their baby in any position.

Size 7

5.2

17

Will allow most people to wear their baby in any position.

 
The Didymos size you'll need depends mainly on the carrying method you are choosing. Apart from that your own size is of some relevance, too. 
 
Kangaroo Korner only carries the 2 largest sizes as we feel the smaller sizes are not as versatile as they typically only accommodate baby in the Cradle or Hip Carry. For maximum versatility, we feel it's more appropriate to purchase a larger size that will accommodate your baby in any position, regardless of your size. In other words, if your own body size is no more than a size 12, you can use a size 6 for all carrying methods. If you are a size 12 or more, you may be better off with a size 7.
 
With any excess fabric you may have after tying your baby securely to your baby, simply tie an extra knot or wrap it around your body one more time to tuck it out of the way.