If your kids are into swimming, or are heading to the beach on their holidays, this Trespass Marine Swim Bag is a real bargain, as it's down to just £5.99 at Argos. That's a fraction of the original £14.99 and by far the best price around.
This is a lightweight and waterproof 3D fish shaped backpack, with adjustable straps. It's a good size at H35, W29, D10cm with a 6.5 litre capacity, so it should be ideal for swimming kit or for nursery.
There seems to be lots of stock around at the moment, and you can reserve and collect for free, or home delivery costs £3.95.