
Must Süsi - Card Holder with RFID Blocking
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Experience Timeless Durability with the Must Süsi Stone Cardholder
Discover the unique elegance of the Must Süsi Metal Cardholder, an exquisite blend of innovation and natural beauty. Crafted from natural slate stone, this cardholder embodies the minimalist and nature-inspired design principles you've been searching for. Each piece is sustainably packaged with environmentally friendly materials, ensuring a guilt-free addition to your collection.
Features & Benefits:
- Exceptional Craftsmanship: Made in Estonia by Seif Design, renowned for its globally unique stone designs, ensuring authenticity and quality.
- Sustainable Fashion: Built from natural slate, formed over millions of years, offering unmatched sustainability that stands the test of time.
- Eco-Friendly Initiatives: Our packaging is fully recyclable, and production processes are powered by green energy sourced from solar panels.
- Security Assured: Equipped with protection against contactless theft, offering peace of mind in today's digital age.
- Versatile Options: Choose between versions with or without a money clip to suit your personal preference.
- Spacious Design: Accommodates up to 12 cards, combining function with elegance in a compact form.
Endorsed by Kersti Kaljulaid, former President of Estonia, this cardholder promises durability and a legacy of sustainability. Elevate your everyday carry with a piece that is not only a style statement but also a testament to endurance and ecological responsibility. Enhance your lifestyle with the Must Süsi today.
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!