
Mr Shark School Backpack for Children
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A Properly Playful Backpack for Young Adventurers
Meet the backpack that's bravely volunteered to wrangle the delightful disorder of childhood. Whether it’s navigating school corridors or conquering the sandbox, this rather good companion carries everything — snacks, books, and the occasional conker — with admirable patience. It even helps them remember their own name, which frankly is more than most of us manage before caffeine.
Why Choose Our School Backpack?
- Spacious Design: Roomy enough for lunches, stories, and whatever today’s treasure happens to be.
- Child-Friendly Access: Easy zippers let them dive into their gear independently, which they’ll be terribly proud of.
- Personalised Security: Features a name label inside, helping ensure it returns home with the correct child — or at least a very similar one.
- Durable and Washable: Water-repellent cotton with a splash-ready coating that’s machine washable. A bit like magic, really, if magic also came with laundry instructions.
Product Details:
- Material: 100 percent cotton with acrylic coating
- Dimensions: 29 x 25 x 10 cm
- Capacity: 7.5 liters
- Recommended Age: Suitable for children aged 3 and up
Quite the showstopper for pint-sized adventurers with even bigger imaginations. Pop one in your basket before their next expedition sets off without it.
SHIPPING + RETURNS
THE RATHER IMPORTANT BITS
This rather lovely piece ships directly from our brand partner - we work with independent brands who are absolutely brilliant and work frightfully hard to create beautiful things.
SHIPPING DESTINATIONS
Now, here's the thing - our wonderful brand partners ship to lots of different places, but not all of them can ship worldwide.
Some are brilliant at international shipping, others prefer to keep things closer to home.
At checkout, you'll see exactly where this particular brand can send your goodies.
We're terribly sorry, but shipping costs do vary rather wildly depending on where you are in the world. The exact figures pop up at checkout - no nasty surprises!
RETURNS
You have 14 days to return items.
Now, we absolutely adore our brand partners - they work incredibly hard and we do try to support them as much as we possibly can. So I'm rather afraid we have to pass the return postage costs back to you. Frightfully sorry about that!
🌍 PLEASE CHOOSE THOUGHTFULLY:
Our wonderful partners put their hearts into everything they make.
Ordering multiple sizes to try at home is rather hard on our planet and makes things jolly difficult for these brilliant independent creators.
When in doubt, do ask us first!
The brands we work with all have a chat option, and they love to chat!
PAYMENT
We're frightfully modern and accept all the usual suspects:
Visa, Mastercard, American Express, PayPal, Apple Pay, Google Pay, and Shop Pay
SECURE AS HOUSES
Everything's properly encrypted and secure - your details are safer than the Crown Jewels!
All prices in lovely British pounds £ GBP, though international chaps will see converted prices.
Any payment pickle? We're here to help sort things out! Contact us

We are Sostter
We met as children. Grew up a few streets apart. Built dens, rode bikes, and eventually — built Sostter.
It started with a shared love of objects that meant something…things with a past, or at least a purpose.
Now, Sostter is our grown-up version of a treasure hunt: a space where design meets storytelling.
We curate independent brands, one-of-a-kind finds, and everyday essentials with character.
Giving Back
We’re proud to support Sutton Night Watch, a grassroots UK charity making a real difference in the lives of those facing homelessness. Through regular donations of stock, supplies, and essentials, we back their mission to offer warmth, dignity, and practical help to anyone in need — right where it matters most.
Sell with us
Sostter partners with independent brands that intrigue, inspire, and bring something genuinely different to the world of fashion, design, and living. Join us!