I voted small but I wish I got the medium 🙃😂 the small works fine but I only have to pack nappies and clothes everything else is provided x
I bought the small thinking that as she gets older she’ll be able to wear it herself. The small is fine, all I really send in her bag is her comforter, suncream and sun hat etc but I definitely wish I’d got the medium so I could fit her wellies / coat and drink etc in too.
I would say one that’s big enough to fit on your own back because the small ones are a pain as they tend to not fit on your own back !
We got small when my 1st daughter was 1 and she still uses it now at 3. It’s just big enough to get a change of clothes in which is perfect for us as their pegs at nursery are small and close together
Check with nursery as we were given a small pe type one as they're preference as they have limited space on pegs
We have the Minnie mouse samsonite backpack for my little girl for nursery, we only need to send spare clothes and like seasonal stuff so it doesn't have to be big, it's actually a lot bigger than we need but she got it from grandparents so we just use that.