The Under Armour Undeniable 5.0 is primarily marketed as a gym bag, but I’ve been using the medium (58L) version for weekend trips and gym sessions for the past year. It’s held up well – better than most bags at this price point.
What You Get
The Undeniable 5.0 comes in four sizes: XS (23L), Small (40L), Medium (58L), and Large (101L). The medium is the sweet spot for most users – big enough for a weekend away, not so large it’s unwieldy as a gym bag.
Key features:
- UA Storm water-resistant coating
- TPU-coated base for durability
- Large vented shoe/laundry pocket
- Dual water bottle slip pockets
- Padded shoulder strap
- Internal slip pockets
How It Performs
Durability
The base and side panels are reinforced with a foam-backed TPU coating. After a year of being dropped on gym floors, tossed in car boots, and stuffed into overhead lockers, mine shows minimal wear. The coating resists scuffs and the structure hasn’t collapsed.
The zips are solid – smooth operation, no snags. The stitching throughout is robust.
Water Resistance
UA Storm is Under Armour’s DWR (durable water repellent) finish. It beads off light rain and keeps contents dry during brief exposure. This isn’t waterproof – don’t leave it out in a downpour – but for walking to and from the gym in British weather, it does the job.
Organisation
The shoe pocket is the standout feature. It’s ventilated (mesh panel for airflow) and fully separate from the main compartment. Sweaty gym shoes stay isolated from clean clothes. The size accommodates up to UK size 11 without cramming.
The internal slip pockets work for phone, keys, and small items. The front zippered pocket holds essentials you need quick access to.
Carrying Options
The padded shoulder strap is comfortable for short distances. The grab handles at the top are sturdy. No backpack straps – if you want to carry it hands-free for longer periods, look elsewhere.
Specifications
| Feature | Detail |
|---|---|
| Capacity | 58L (Medium) |
| Dimensions | 66 x 30 x 30 cm |
| Weight | 0.8 kg |
| Material | 100% polyester with TPU coating |
| Water resistance | UA Storm DWR coating |
Pros
- Durable construction – TPU base and reinforced panels hold up well
- Effective shoe compartment – Vented, separate, properly sized
- Good water resistance – Handles everyday exposure
- Reasonable price – £35-45 for a bag that lasts
- Clean design – Subtle branding, professional enough for work travel
Cons
- No backpack straps – Shoulder carry only
- Basic interior – Main compartment is one big space, limited organisation
- Water bottles exposed – Side pockets aren’t covered
- Not cabin-compliant – Medium size exceeds many airline restrictions
Sizes Compared
| Size | Capacity | Best for |
|---|---|---|
| XS | 23L | Daily gym kit |
| Small | 40L | Gym + change of clothes |
| Medium | 58L | Weekend trips, larger gym loads |
| Large | 101L | Extended travel, team sports |
Who Should Buy It
The Undeniable 5.0 works well for:
- Gym regulars who need to separate sweaty kit from clean clothes
- Weekend travellers who want one bag for short trips
- Sports players needing equipment and clothing in one bag
- Anyone wanting a durable, no-fuss duffel at a reasonable price
It’s less suitable for:
- Frequent flyers – doesn’t meet cabin baggage limits
- Those wanting backpack carry – shoulder strap only
- Organisers – minimal interior pockets
Compared to Alternatives
vs North Face Gilman: The Gilman has more premium materials and backpack straps. Costs more, more versatile for travel.
vs Adidas Defender: Similar price, similar features. The UA has better water resistance; the Adidas packs flatter.
vs Nike Brasilia: Near-identical spec and price. Personal brand preference.
Verdict
The Under Armour Undeniable 5.0 is a solid gym/weekend bag at a fair price. The vented shoe pocket genuinely useful, the water resistance handles British weather, and the build quality holds up to regular use.
It’s not innovative or premium – it’s just a well-made duffel that does what it’s supposed to. For £35-45, that’s exactly what most people need.
