Quality, Cool, Practical
1/5
2/5
3/5
4/5
5/5

See all pictures

The Under Armour Undeniable 4.0 Gym Bag is an established option for multi-sport athletes. So established that it’s the 4th iteration because of popular demand. This is fairly feature-filled bag that costs a little more because of its popularity, but also because of its quality.

Gym bags have certain design features that appeal to different people. The Undeniable 4.0 is well suited for basketball, soccer and even racket sports. It’s a sports bag for everyday training too and, increasingly, a duffel bag option for weekend trips.

The construction can handle your training essentials without ripping, whether you’re into lifting, soccer, boxing, or any active lifestyle. Paired with UA’s Storm technology, the high water resistance will keep your items dry under showers.

After some rigorous testing, here’s what Undeniable 4.0 Gym Bag has in store for you.

Our Overall Review

We have thoroughly tested - and read reviews from other experts and users. In summary, this is what we think:

4.8

Reasons to buy:

  • check-mark
    There are plenty of sizes and vivid colorways to choose from
  • check-mark
    The overall construction is sturdy
  • check-mark
    You can stay organized with all the pockets
  • check-mark
    There’s a built-in shoe compartment
  • check-mark
    Storm tech made it highly water-resistant
  • check-mark
    There’s an additional lash point at the front
  • check-mark
    The side mesh pocket keeps away any bottle spills from reaching your items in the main compartment
  • check-mark
    It’s a super versatile sports bag

Reasons NOT to buy:

  • check-markShoulder strap not as good when carrying heavier loads

Where to buy:

Under Armour Undeniable 40 Product Image

Under Armour Undeniable 4.0

Train in Style

Under Armour has been one of the most famous go-to brands for those who love living an active lifestyle. Their Undeniable 4.0 sports bag makes it easier to carry your training essentials, and you also rock fitness sessions in style.

You can take a pick from numerous designs and sizes, and all of them seem to embody the durability to go head-on with your discipline. With easy access and organization, you stay clutter- and stress-free while counting your reps, sets, laps, or rounds.

It’s a sports bag for the modern-day fitness enthusiast. Undeniable 4.0 is a fairly-priced option that appears to perform and survive well.

Specs & Features

  • Materials: 100% Polyester, Textile Lining, UA Storm Technology
  • Sizes: 30 Liters, 41 Liters, 58 Liters, 85 Liters
  • Colors: Academy Blue/Silver, Black/Silver, Red/Silver, Baroque Green/Comet Green, Black/Metallic Gold, Mauve Pink/Ash Plum, Cordova, Starlight/Breeze, etc.
See the complete list of the best Gym Bag here!

Construction and Design

Though it might seem like Undeniable 4.0 has nothing special in its design, this polyester-made sports bag carries Under Armour’s signature STORM technology (more on that in a bit). On the outside, it’s got a typical duffel bag look. But what do we like most about this US sports bag aesthetically? The colors are vivid, and they come in both plain and adventurous combos! You can also choose from four sizes- xs, small, medium, and large. (Note: the sizing runs bigger than expected.)

You can fit a basketball inside no matter what size you choose.

You can go as chic, bold, or low profile with all the colorways.
You can go as chic, bold, or low profile with all the colorways.

Related Reviews

Now, let’s take a closer look at Undeniable 4.0’s build. Since it’s polyester-made, you can expect that it has good wrinkle and abrasion resistance. It also won’t stretch or get heavier when in contact with water since it doesn’t absorb moisture. Plus, this sports bag comes with US’s Storm technology-the fabric was DWR-treated to amp up its water resistance.

Storm technology provides high water resistance to your sports bag.
Storm technology provides high water resistance to your sports bag.

Water beads and rolls off as soon as it touches the fabric. However, it’s worth noting that it’s not waterproof. Your stuff will stay dry for a short time under light showers but not for long exposure under torrential rain. You might want to check out waterproof alternatives like Canway Sports Gym Bag, Thule Chasm Duffel, and King Kong Heavy Duty Duffel. Or, you might as well opt for a waterproof backpack.

The stitching seems durable. There are rare complaints about the seams coming off, but we haven’t had that issue. Undeniable 4.0’s zippers feel flimsy, so you might need extra caution when using them. The 2-way zipper at the main compartment also allows you to carry your sports bag from either shoulder.

Overall, this gym bag from Under Armour offers a decent build. Besides, you can choose from various designs and pick one that speaks out for your personality.

Click here for more gym bags to compare and contrast.

Harness System

Undeniable 4.0 has a standard adjustable shoulder strap webbing. It does what it’s supposed to, but not as comfy when you’re carrying it for long periods. There’s also a bit of confusion regarding the padding. The description of this sports bag didn’t clarify that the xs/small doesn’t include a pad and that it’s got a fixed strap. Only medium and large/xL have padding in the removable shoulder strap. It’s a bummer since the pad alleviates a bit of skin-digging irritation.

Only the medium and large sizes have a padded and removable shoulder strap.
Only the medium and large sizes have a padded and removable shoulder strap.

The swivels of the shoulder strap are also plastic. They can endure enough weight, but you can’t depend on them for heavy hauling. If you’ll be carrying heavy, it’s best to opt for gym bags with metal hardware like Kuston Sports Gym Bag, LeoLake Sports Gym Bag, or Kemy’s Athletic Gym Bag.

Undeniable 4.0 vs. Kemy’s Sports Duffle

Metal swivel hooks are still more durable and easy to use than a clip-on plastic swivel.
Metal swivel hooks are still more durable and easy to use than a clip-on plastic swivel.

Undeniable 4.0 sports bag also has the classic dual-top handle. Drop your gym bag and snatch it up whenever you need to.

Opt for hybrid gym bags like G4Free Gym Bag, MIER Large Duffel Backpack, or the UA SC30 Storm Duffel if you want a snug fit. All of these models morph into a backpack for close-to-body carry.

Undeniable 4.0 offers basic harnessing- not the sturdiest or comfiest. However, if you’re not planning to carry it for a long time, you won’t have any problem.

Alternatively, you can jump to our main guide for more gym bags.

Storage

With lots of compartments on board, you’re sure to stay clutter-free when using this sports bag from Under Armour. Undeniable 4.0 is ready to accommodate all your essentials, whether you’re off to the gym, for a quick trip, or training in the field.

Main Compartment

The main compartment is super spacious. You can sneak in even bulky gear. Like playing basketball? Football? You can carry your basketball inside. As part of the test, we tried fitting in three footballs, and there was still a lot of spare room in this sports bag.

You’ll find a hanging pocket as well. It’s a good place for small items you want to secure, like keys, cards, and IDs. Although, it’s worth noting it’s not a zipped pocket but instead has an overhang for protection. It’s not as safe as MarsBro Gym Bag’s inner pocket.

Undeniable 4.0 vs. MarsBro

The hanging pocket of the Undeniable 4.0 Sports Bag doesn't have a zipper closure.
The hanging pocket of the Undeniable 4.0 Sports Bag doesn't have a zipper closure.

This UA sports bag can accommodate your gym needs: boxing gloves, hand wrap, headgear, jump rope, bands, and a lifting belt. It also doubles as an overnighter if you’re off for a night under the stars.

Side Pockets

The pair of side pockets come very handy and can adapt to particular purposes. On the right, you have the shoe compartment. We like how it comes with a mesh panel at the top to allow ventilation. That’s a perk you won’t enjoy fully with Kuston Sports Gym Bag and its small vent holes.

The shoe compartment is also just fabric. You can compress it to create more space in the main compartment when not in use. That’s a sensible design you’ll find in almost any gym bag.

On the left side, Undeniable 4.0 has a mesh pocket. It’s an excellent spot for your water bottles, keeping them away from your items in the main compartment. This way, even if there’s any leak, your belongings stay dry. Canway Sports Gym Bag and INOXOTO Fitness Gym Bag rock the same feature. Bonus, the latter has a zipped pocket behind it.

The side pockets of this UA sports bag model are practical and functional. Breathability seems to be the primary motive, along with versatility.

Front Pockets

For your extras, Undeniable 4.0 has a couple of zipped front pockets. At the front, the small pocket works well for your Bluetooth headphones, mints, and some change. The bigger one behind it is a good place for your towels or tablet. That’s way ahead of Thule Chasm Duffel or Adidas Defender II, which don’t have any front pockets.

A plastic D-ring is also present as a lash point. If you want to clip in additional gear, you can utilize it to carry more.

The front pockets are practically-sized, with a D-ring as a lash point.
The front pockets are practically-sized, with a D-ring as a lash point.

It could’ve been better if there was a zippered rear pocket for a more accessible and secure space for your valuables, like your phone. You can check out Apera Performance Duffel and Suruid Workout Gym Bag if you’re interested in that.

But overall, the entire storage space you get with the UA Undeniable 4.0 sports bag is well-organized and well-thought. Every compartment has your ease of use in mind, and they perform with flying colors.

You can pack up your training shoes, some refreshment, lots of gear, and extra sets of clothing without any problem when using this sports bag from Under Armour.

Not your bet? See more gym bags here. 

Summary

Under Armour Undeniable 4.0 Sports Gym Bag is a good option that won’t rip holes in your pocket. It allows you to choose size and design according to your preference and intended purpose for roughly $35-$122.

Durability and water resistance are decent enough to withstand the test of time (under normal use). But still, manage your expectations. It’s not for super heavy hauling. This sports bag is meant for, well, training and gym sessions. You have duffel bags made for rugged and traveling purposes if that’s what you need.

The value Undeniable 4.0 returns for its price is reasonable. It’s not the best of the bunch- not the most comfortable or heavy-duty. But within its price point, this sports bag is an option that won’t let you down.

You can also read our complete lowdown on the best gym bags for more info.

Buy this gym bag if:

  • You want an additional member of your UA artillery
  • Looking for a versatile sports bag

Our Overall Review

We have thoroughly tested - and read reviews from other experts and users. In summary, this is what we think:

4.8

Reasons to buy:

  • check-mark
    There are plenty of sizes and vivid colorways to choose from
  • check-mark
    The overall construction is sturdy
  • check-mark
    You can stay organized with all the pockets
  • check-mark
    There’s a built-in shoe compartment
  • check-mark
    Storm tech made it highly water-resistant
  • check-mark
    There’s an additional lash point at the front
  • check-mark
    The side mesh pocket keeps away any bottle spills from reaching your items in the main compartment
  • check-mark
    It’s a super versatile sports bag

Reasons NOT to buy:

  • check-markShoulder strap not as good when carrying heavier loads
FAQ

Frequently asked questions about the Under Armour Undeniable 4.0 Gym Bag

What are sports bags called?

Sports bag, a.k.a. gym bag, duffel bag, or carryall. Whatever you call it, it’s typically cylindrical-like in shape with a rectangular base. You can access it via a top zipper with dual top handles. A sports bag might also have a detachable shoulders strap and a dedicated shoe compartment.

What is the best sports bag?

To save you time, here are some of the best sports bags we tested:

Spacious: PUMA Contender Gym Bag

Best Budget: HOLYLUCK Drawstring Bag

Compact: MarsBro Gym Bag

Waterproof: Canway Sports Gym Bag

Sturdy: Kuston Sports Gym Bag

Filled with Pockets: Everest Gym Bag

Best Backpack: G4Free Gym Bag

You’ll also find more options in our complete guide to the best sports bags.

What are sports bags used for?

A sports bag is a convenient option for every active individual, whether for the gym, the field, or a studio. But with so many designs emerging in the market, versatility to cross from the indoor fitness lifestyle to the rugged outdoors is not surprising. People now also use it for traveling, hiking, camping, and other activities where they need to carry personal items.

How do I wash my Under Armour sports bag?

Spot clean your Under Armour sports bag using a damp cloth, then let it air dry in a place with proper ventilation. Never throw it inside the machine, tumble/iron dry, or use bleach/fabric softener.

Where can I buy a sports bag?

You can choose from tons of sports bags online from platforms like Amazon and REI. Before adding to the cart, ensure that you sifted through customer reviews, so you don’t regret your purchase. If possible, invest some time going through in-depth reviews to see how the sports bag performs after tests in real-life scenarios.

Comments

Subscribe
Notify of
guest
0 Comments
Inline Feedbacks
View all comments