My DS starts pre-school in Feb & I'm trying to figure out what sized backpack to get him.

He doesn't need to take sheets, just m-tea, lunch, change of clothes & a hand towel. As his lunch will go straight in the fridge, I'm considering getting him a lunch bag that won't actually go in the backpack.

I've seen some backpacks sized about 25W x 29H x 10D. This isn't large I know, but do you really need a big bag? My son is a little man of 13kgs (3.3yrs).

I'm keen to hear from those lovely mums out there who have done this b4 :-)

Thanks