The Neko baby carrier is a wrap conversion carrier with a sturdy cord waistband and with crossable straps that can be worn rucksack style. Typically, this will fit ages 6-9mo upwards as it has a wide base. 7-15 kg.
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