It is never too soon to get them used to carrying their own things around. In my experience, when they're younger there's nothing they like better than having their own backpacks. Especially one with lots of pockets! This Elfin Backpack looks great, and is available at Tesco for £2.24.
This is a fabulous deal if you can collect instore for free. Not so much if you have to have it delivered. Standard delivery is £5. Do check that there's a store handy for you that does do collections, as not all do. You can look this up on their website.
The Elfin Backpack is pink - very pink from the photo. It is made from polyester, and according to the description has a front zip pocket and side pocket. From the picture it clearly has more outside pockets than that, with ones on both sides and three on the front.
The shoulder straps are adjustable, which is always handy for little ones so you can keep using the bag as they grow. The backpack's height is 44cm and the width is 33cm. It has a depth of 4cm.
Thanks to lucerysmum at HUKD!