The Connecta preschool size carrier is lightweight and simple with no waistband. It has crossable straps for front carrying and is worn rucksack style on the back.
It has a hood that can be folded up.
Here are Rosie's videos for how to do a front carry with a small baby, a bigger baby and a back carry with an older baby (approx sitting up age). More Connecta videos here
There are more videos and photo tutorials listed on the Carrying Matters website.
The Sheffield Sling Surgery website is here - full of useful information about safety, all sorts of articles about warm/cold weather carrying. knee to knee support, big kid carrying and so on
Facebook page is here and the online support group the Virtual Sling Surgery is here