Sorry for going OT, bogie but if you like Willow as a name, I think the odds are you might like slings too.
A pod or podaegi, Solo, squashes up small to fit in a bag, quick to put on and great for toddlers who suddenly decide you've made them walk quite far enough.
Secondhand Zidee podaegi are about £40 and I have been told they are not that hard to make as slings go, but sewing name tags is the extent of my skills.