I have been looking for a sling with a buckle waist and shoulder straps to tie. I am currently trying out a Storchenweige
www.lovetobenatural.co.uk/storchenwiege-baby-carrier-lilly.html
which is very comfy but doesn't come in all the exciting colours/designs that some other slings do!
I have looked at so many they are all confused in my head now 
Can anyone reccommend any to me please?
TIA