Your phone goes everywhere with you, so why not make it look this good?
ESR teamed up with artist duo Craig & Karl to bring their bright, graphic style to the things you carry every day. The ESR × Craig & Karl collection has two iPhone case designs, Big OK Energy and Pocketful of Love, plus three Polka Hi magnetic wallets to go with them. They’re all available now on esrtech.com.
A little extra is coming, too. Buy a case and wallet bundle starting November 14, 2026, and you’ll get a free luggage tag. Only 1,000 are available.
Meet Craig & Karl
Craig & Karl are Craig Redman and Karl Maier, an artist duo who met at art college in Australia. Craig now works from New York and Karl from London, and together they make design, illustration, animation, and installations.
You can spot their work from across a room. It’s built on bold color, simple graphic shapes, and playful patterns, and it has shown up in projects for Apple, Google, and Nike. Follow them on Instagram at @craigandkarl to see more.
The match with ESR seems like a natural collaboration. ESR’s design language is rounded, flexible, and focused on making tech easier to use. Craig & Karl’s art is bold, expressive, and made for people who like their things to have personality. Put the two together and everyday tech starts to feel a little more personal.
Two Case Designs. Two Very Different Moods.
Same case. Two very different moods. Which one is you?
Big OK Energy: Say OK to More Joy
Loud, joyful, and hard to ignore.
A bold “OK” sits front and center. The graphic carries the color, and it’s lighthearted enough to catch the eye and give the case instant attitude.
Pick this one if you treat your phone as part of your look. You follow art, fashion, and design accounts. You like accessories that start conversations, and you’d rather your tech had a personality than blend in.
Pocketful of Love: A Pocket-Sized Collage
Playful, layered, and full of little surprises.
Sticker-like icons and bold color turn the back of your phone into a mood board you carry everywhere. It feels collected rather than polished, and there’s always one more detail to notice.
Pick this one if you want art in your everyday carry that feels like yours. It suits anyone who likes playful graphics, stickers, prints, and collage-style design. You get the personality without making your phone harder to use, which is the same spirit behind ESR’s Tech Made Easier.
Both designs come in versions for iPhone 18 Pro, iPhone 18 Pro Max, and iPhone Duo. Pick your model on each product page.
Artist-Designed. Built for Everyday Use.
The artwork gets your attention first. The case underneath is built for daily life.
Art You Can Feel
Craig & Karl’s graphics are applied with UV printing, which gives rich color and a slightly raised, tactile finish. Each case arrives in special-edition packaging.
A Built-In Stand for Hands-Free Moments
The Flex Stand is built into the case. Open it to watch something over lunch, join a video call, follow a recipe, or take a hands-free photo. Close it when you’re done, and it goes back to protecting your phone.
Looking for an iPhone 18 Pro Max case with stand?
Protection Behind the Artwork
The Classic Hybrid design pairs the printed back with a TPU frame that guards the edges against scratches. Raised edges and built-in camera protection add extra coverage, and a built-in Camera Control cover keeps that area fully protected while staying responsive.
The case has been tested across 26 drops from 16 feet, with 4× military-grade protection verified through SGS testing.
Protection and Camera Control details can vary by phone model, especially with the folding design of iPhone Duo. Check the product page for your model before you order.
Which Polka Hi Wallet Is Right for You?
Now for the other half of the collection.
All three magnetic wallets carry the Polka Hi artwork, a cheerful “HI” graphic that adds another hit of Craig & Karl color to the back of your phone. Each one snaps onto the case with 1,500 g of magnetic hold and includes RFID protection against unauthorized scans.
The easiest way to choose:
Pick the artwork you like. Then pick the wallet you actually need.
| Wallet | What It Does | Best For |
|---|---|---|
| Classic Magnetic Wallet | Slim magnetic card storage | People who just want card storage |
| Classic Magnetic Wallet Stand | Card storage plus a 15°–175° adjustable stand | People who want the wallet itself to prop up the phone |
| Classic Magnetic Wallet Stand with Grip | Card storage, adjustable stand, and a finger loop | People who use their phone one-handed and want extra hold |
Since the case already has its own Flex Stand, the stand wallets are an “if you want it” option. You don’t need one for hands-free viewing.
Classic Magnetic Wallet: Keep It Simple
This one holds up to 5 cards, or 4 cards and 3 bills. A 20 mm opening at the bottom makes it easy to push cards up when you need them. There’s no stand and no finger loop, just card storage in the Polka Hi design.
Choose it if cards are all you want to carry, or if the case’s Flex Stand already covers your hands-free needs.
Classic Magnetic Wallet Stand: Cards Plus a Stand
Want the wallet itself to prop up your phone? This version holds up to 4 cards and 3 bills and adjusts from 15° to 175° for hands-free viewing.
Classic Magnetic Wallet Stand with Grip: A Little More Hold
The Grip version adds a secure finger loop. Slide a finger through for steadier one-handed scrolling and easier navigation.
It keeps the 15°–175° adjustable stand, RFID protection, and storage for up to 4 cards and 3 bills. If you use your phone one-handed a lot, start here.
One Compatibility Note Before You Choose
The three Polka Hi wallets are designed for the iPhone 18 Pro and iPhone 18 Pro Max cases in this collection.
They aren't compatible with iPhone Duo cases. Because of the Duo’s proportions, the wallets extend too far past the back of the phone and don’t sit correctly on the case. If you’re choosing an iPhone Duo case, use it on its own.
Pair Your Case and Wallet Your Way
On iPhone 18 Pro and iPhone 18 Pro Max, the case and wallet were designed to work together. ESR Lab testing shows the wallet’s placement and dimensions were adjusted so it doesn't cover or interfere with the Flex Stand. Leave the wallet attached, open the stand, and use it as usual.
Now for the fun part: the look.
Want it loud? Pair Big OK Energy with Polka Hi. The big OK and the cheerful HI make a bright, matching set.
Want it more layered? Pair Pocketful of Love with Polka Hi. The sticker-like icons stay visible around the wallet, and the HI graphic adds one more piece to the collage.
Want it low-key? Go with the standard Magnetic Wallet, or skip the wallet and let the case do the talking.
Every wallet covers part of the back of the case, so use the photos below to see how much of each design stays visible once it’s attached.
For iPhone Duo, stick with the case on its own.
Free Luggage Tag. Yes, Really.
Buying the full setup comes with a little extra. Here’s how it works:
- What you need: a qualifying ESR × Craig & Karl case-and-wallet bundle. A case or wallet alone doesn’t qualify.
- What you get: a free limited-edition luggage tag. There are 1,000 in total.
- When: starts November 14, 2026, and runs while supplies last.
- How to claim: nothing to do. The luggage tag is added to your order automatically at checkout.
- Other discounts: the gift is separate from the bundle discount, so you can still use other applicable offers or discount codes on the same order.
- iPhone Duo: Duo cases don’t qualify for the bundle gift, since the wallets don’t fit them.
Get Yours Before They’re Gone
ESR × Craig & Karl FAQs
Which iPhone models are included in the ESR × Craig & Karl collection?
The collection includes cases for iPhone 18 Pro, iPhone 18 Pro Max, and iPhone Duo. The 18 Pro and 18 Pro Max cases are also listed for iPhone 17 Pro and iPhone 17 Pro Max, so check your model on the product page before you order. The three Polka Hi magnetic wallets are designed for the iPhone 18 Pro and iPhone 18 Pro Max cases. They are not compatible with iPhone Duo cases.
How many Craig & Karl case designs are available?
Two: Big OK Energy and Pocketful of Love. Big OK Energy puts a bold OK graphic front and center. Pocketful of Love uses sticker-like icons and bold color to make a pocket-sized collage.
What’s the difference between the three magnetic wallets?
The Classic Magnetic Wallet is for card storage and holds up to 5 cards, or 4 cards and 3 bills. The Classic Magnetic Wallet Stand holds up to 4 cards and 3 bills and adds a 15°–175° adjustable stand. The Classic Magnetic Wallet Stand with Grip has the same capacity and stand, plus a finger loop for one-handed use. All three include RFID protection.
Do the ESR × Craig & Karl wallets support Apple Find My?
No. None of the three wallet styles in this collection supports Apple Find My.
Can I use the wallet and the Flex Stand at the same time?
Yes, on iPhone 18 Pro and iPhone 18 Pro Max. ESR Lab testing shows the wallet’s dimensions and placement were adjusted so it doesn’t block the case’s Flex Stand. You can leave the wallet attached while you open and use the stand.
How do I get the free luggage tag?
Buy a qualifying case-and-wallet bundle starting November 14, 2026. The luggage tag is added to your order automatically at checkout while supplies last, and you don’t need a code. Only 1,000 are available. Buying a case or wallet on its own doesn’t qualify, and iPhone Duo cases aren’t included in the bundle gift.
When does the ESR × Craig & Karl collection launch?
It’s live now. Shop the full collection at esrtech.com. The free luggage tag with qualifying bundles starts November 14, 2026, and runs while supplies last.
Are the ESR × Craig & Karl wallets compatible with iPhone Duo?
No. The three Polka Hi wallets are not compatible with iPhone Duo cases. They extend too far past the back of the phone and don’t sit correctly on the case, so we recommend using the Duo case on its own.
Pick Your Art. Pick Your Wallet. Make It Yours.
Big OK Energy or Pocketful of Love.
On iPhone 18 Pro and iPhone 18 Pro Max, add the Polka Hi wallet that fits how you use your phone: card storage, an adjustable stand, or a stand with a finger loop. Using an iPhone Duo? Pick the design you love and keep the setup simple with the case on its own.
Shop the ESR × Craig & Karl Collection
Want more ways to build your everyday setup? Browse ESR’s Flex Stand cases, magnetic wallets, and printed iPhone cases.
