Cubi CardNinja Ultra Slim Adhesive Credit Card Wallet

Last updated date: September 10, 2019

DWYM Score

9.4

Cubi CardNinja Ultra Slim Adhesive Credit Card Wallet

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We looked at the top Phone Card Holders and dug through the reviews from some of the most popular review sites. Through this analysis, we've determined the best Phone Card Holder you should buy.

Editor's Note April 26, 2021:
Checkout The Best Phone Card Holder for a detailed review of all the top phone card holders.

Overall Take

Built with 3M adhesive that ensures a residue-free stick-on, the Cubi CardNinja Ultra Slim Adhesive Credit Card Wallet is built to work with some of the most popular cellphones. You may need a case if you have a newer phone, since many modern phone finishes don't allow 3M adhesive to stick. One of the best things about this pick, though, is the flexible pocket that will accommodate up to eight cards.


In our analysis of 22 expert reviews, the Cubi Cubi CardNinja Ultra Slim Adhesive Wallet placed 4th when we looked at the top 9 products in the category. For the full ranking, see below.

From The Manufacturer

CardNinja can store up to 8 cards AND cash using a durable elastic fabric (driver’s license, gym card, train pass). Using 3M adhesive, CardNinja securely attaches to the back of your device. It removes cleanly too! Compatible with the following smartphones: iPhone Xs / Xs Max / Xr /X / 8/ 8 Plus / 7 / 7 Plus / 6 / 6 Plus / 5 / 5s / 5c / 4 / 4s, Samsung Galaxy S6 / S5 / S4 / S3, Galaxy Note 5 / 4 / 3 / 2 / 1, LG G3 / G2 / Optimus series, Nexus 6 / 5 / 4, HTC M8 / EVO / Desire / Sense, iPod Touch, Sony Xperia and much more! Works with nearly ANY phone case including: Otterbox, Lifeproof, CaseMate, Belkin, Speck, Apple and more. Reviewed by the biggest names in tech: CNET, The New York Times, Macworld, USA Today, The Wall Street Journal, The Next Web, and Cult of Mac The Original! CardNinja (by cubi) is the world’s first PATENTED adhesive smartphone wallet. Designed in California

Expert Reviews

Expert Summarized Score

10.0
1 expert reviews

User Summarized Score

8.4
2,250 user reviews

What experts liked

The patented Card Ninja is the ultimate smartphone accessory! As simply as peeling a sticker, Card Ninja attaches to your phone or case using high strength adhesive and won't come off until you want it to. And you can remove it cleanly without leaving any residue!
- Infestis

What experts didn't like

An Overview On Phone Card Holders

Students love phone card holders. Instead of carrying a purse or wallet, they can simply stick their IDs and payment cards in a pocket on the back of a smartphone and head to class. But phone card holders aren’t just for college students. They’re perfect for keeping up with your ID cards at the gym, while out with friends or even for everyday use.

Kristin Forte/Simplemost Media

In fact, these adhesive card pockets have become so popular in recent years, they’ve evolved far beyond the basic versions you could initially buy. You can find a wide variety of designs along with different pocket options to fit various preferences. But it’s important to make sure each of those pockets is designed to prevent your cards from falling out, whether that means nonslip material or a tightness that keeps your cards in place.

Kristin Forte/Simplemost Media

The adhesive used to attach the holder is also important, especially if you’re putting it directly on the back of your phone rather than on a case. You’ll need a holder with adhesive strong enough to stay in place, but it can’t be so strong that it damages the back of your phone. Many manufacturers use adhesive from 3M, maker of Post-It Notes, but there are competing products that can provide similar results.

Kristin Forte/Simplemost Media

Once you’ve narrowed your choices to the card holders that will stick to your phone, you’ll need to take a look at the pocket design that works for you. How many cards you’ll be able to hold depends on the thickness of the cards you’re adding.  But typically, you can squeeze two to three cards into a phone card holder. Some phone card holders can stretch to hold even more, though, and still others have an extra front pocket that comes in handy for storing miscellaneous items like your office key or cash.

Kristin Forte/Simplemost Media

The Phone Card Holder Buying Guide

  • The first consideration when you get your new phone card holder is whether you’ll attach it directly to the back of your phone or to the protective case you have on it. But if it’s going directly on your phone, you’ll want to make sure the adhesive doesn’t damage it. Some phones use 3M adhesive that sticks well without leaving a residue. But others, on the other hand, use a special type of adhesive that promise to sticks better to the newer glass-back style of cellphones.
  • It’s important to note that some iPhones are designed with fingerprint-resistant backs, which means you will need a case to make the adhesive stick. Since glass-back phones are becoming increasingly popular, a case may be in order for any type of phone card holder you buy moving forward, though.
  • Capacity is a major deciding factor in a phone card holder. The vast majority of phone card holders will hold up to three cards, which may mean your student ID, driver’s license, and a credit card, at most. There’s also a style of phone card holder that features a unique stretchy design that lets you slip in as many as eight cards. This also gives you the flexibility you need if you want to tuck some cash into it. A third type of design has two pockets: the back pocket, which holds up to four cards, and the front pocket, which can hold cash and/or a car or office key.
  • As handy as a phone card holder can be, it won’t be useful at all if your cards slide out. It’s important to look at how tight each pocket is, but some phone card holders are built with a non-slip interior grip that keeps your cards in place.
  • It’s also important to look at the materials used to make your phone card holder. A holder made from 100% genuine leather may be the best bet if you’re looking for durability.