Sling covers/weather protection?

[Lucy]

Hi

Has anyone got a weather cover for their sling? I use a BabyBjorn and a Coorie sling but as Olivia is growing out of the BB I was considering getting one similar to Petchy's new one. However, with the weather getting more wintry every day I don't want to get a new sling if I can't get a cover to keep Olivia dry.

Does anyone know where I can get one?

Thanks

Lucy