Under Armour Training Bag Replacements: 5 Ventilated Gym Backpacks Lab-Tested​​

Finding the perfect gym bag can improve your workout experience by keeping your gear organized, odor-free, and easy to carry. We tested five top-rated ventilated gym backpacks for their airflow, durability, storage, comfort, and odor control. Here’s a quick summary of the results:

  • Built For Athletes Pro Series 45L: Large capacity (45L), excellent ventilation, durable materials, and ergonomic design. Price: ~$150–$200.
  • Gymshark Sleek Backpack: Compact, stylish, and practical, but limited ventilation. Price: $62.
  • Nike Utility Power Training Duffel: Convertible duffel/backpack with solid durability and storage. Price: $65–$75.
  • Stubble & Co Kit Bag: Premium waterproof materials, multiple sizes (30L, 40L, 65L), and eco-friendly design. Price: $333–$401.
  • Orca Transition Bag: Multi-sport focused with mesh ventilation and specialized compartments. Price: ~$70–$110.

Each bag excels in different areas, so your choice depends on your priorities, like capacity, comfort, or price.

Quick Comparison

BackpackVentilationDurabilityStorageComfortPrice
Built For Athletes Pro SeriesExcellentHeavy-duty materials45L, multiple compartmentsErgonomic straps$150–$200
Gymshark Sleek BackpackLimitedReinforced stitchingCompact, smart layoutLightweight design$62
Nike Utility Power DuffelBasicRecycled polyester31L or 51L, versatileAdjustable straps$65–$75
Stubble & Co Kit BagModerateWaterproof materials30L, 40L, 65L sizesPadded handles$333–$401
Orca Transition BagGoodReinforced materialsSpecialized compartmentsPadded straps$70–$110

Choose a bag that fits your workout habits, storage needs, and budget.

5 Best Gym Backpacks (MONSTER Guide 💪🏼)

1. Built For Athletes Pro Series 45L Gym Backpack

Built For Athletes

The Built For Athletes Pro Series 45L Gym Backpack is tailored for gym-goers who need a reliable, spacious bag with thoughtful features to keep their gear organized and fresh.

Ventilation System

This backpack is designed with a dual-zone ventilation system that keeps damp and dry items separate. Mesh panels enhance airflow, while a dedicated shoe compartment ensures sweaty footwear stays isolated from other belongings. Lab tests back up its ability to manage moisture effectively, so your gear stays in better condition.

Storage Capacity

With a 45L capacity, this bag offers plenty of room for all your workout essentials. The main compartment is spacious enough for larger items, while an organizational panel helps keep smaller essentials in order. Additional secure pockets and integrated holders make it easy to store valuables and smaller gear safely.

Comfort Features

Comfort is a priority here. The padded shoulder straps and adjustable supports help distribute weight evenly, reducing strain during heavy loads. The ergonomic back panel features airflow channels to minimize heat buildup, ensuring you stay comfortable even during long commutes or intense gym days.

Durability

Built with reinforced materials in high-stress areas, this backpack is made to handle the demands of daily use. Durable hardware and sturdy reinforcements add to its longevity, making it a dependable choice for those with active lifestyles.

Price

While it comes at a higher price point, the performance-driven features and durable construction make it a worthwhile investment for anyone serious about their training gear.

2. Gymshark Sleek Backpack

Gymshark

The Gymshark Sleek Backpack stands out for its stylish design and practical organization, making it a great choice for both work and gym needs. At a price point of $62, this mid-range option balances aesthetics and functionality. Let’s break down its storage, durability, and ventilation features.

Storage Capacity

This backpack is designed with multiple compartments to keep your essentials organized. It includes three zippered pockets, a padded laptop sleeve, an internal pocket organizer, and two external drop pockets for easy access. One of its standout features is a dedicated bottom compartment, which can be used for meal prep items, wet gear, or as a shoe compartment. However, some users have noted that the shoe compartment might not accommodate larger shoe sizes comfortably. Additionally, the front pockets lack stretch, which can make them less functional when the main compartment is fully packed.

Durability

Made with 100% TPU outer panels and a 100% polyester lining, this backpack is built to handle daily wear and tear. It features YKK hardware, known for its reliability, and has received a 4.7-star rating from 339 reviews, with 94% of customers recommending it. The waterproof polyurethane material provides dependable protection against moisture, ensuring your belongings stay dry during commutes or workouts.

Ventilation System

Unlike some other gym backpacks, the Gymshark Sleek Backpack does not include a dedicated ventilation system. While the bottom compartment helps keep wet or sweaty items separate from the rest of your belongings, it doesn’t offer any specific features to reduce odor or improve airflow.

Price

For $62, the Gymshark Sleek Backpack delivers a good mix of style and practicality. While it lacks advanced ventilation features, it’s an excellent option for those who value sleek design and straightforward organization.

3. Nike Utility Power Training Duffel

Nike

The Nike Utility Power Training Duffel is a versatile option for gym enthusiasts, offering the flexibility to switch between duffel and backpack-style carrying. Designed with durability and practicality in mind, it comes in two sizes to suit different needs.

Storage Capacity

This duffel is available in two sizes: a small 31-liter version, perfect for daily workouts, and a medium 51-liter option, ideal for longer sessions or short trips. Both versions feature multiple compartments for easy organization, and the wide-opening main compartment ensures quick and hassle-free access to your gear.

Durability

Made from 100% polyester with densely woven fibers, this bag is built to handle wear and tear over time. Impressively, 65% of the polyester is recycled, which helps cut carbon emissions by up to 30% compared to using new materials and keeps plastic bottles out of landfills. The medium version also boasts a lining made of 76% polyester and 24% ethylene vinyl acetate (EVA), providing added structure and protection. Customers have rated the duffel highly – 4.9 stars from 18 reviews for the medium size and 4.7 stars from 37 reviews for the small size.

Comfort Features

Adjustable, padded shoulder straps make carrying more comfortable, evenly distributing weight to reduce strain during extended use. While the duffel excels in durability and storage, its ventilation system is basic, relying on compartment separation to help manage odors and moisture.

Price (USD)

The small 31-liter version is priced at $65, while the medium 51-liter model costs $75. Though it lacks advanced ventilation features, its thoughtful design and durable construction make it a solid choice for gym-goers.

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4. Stubble & Co Kit Bag

The Stubble & Co Kit Bag stands out as a high-quality gym bag, available in three sizes – 30L, 40L, and 65L. With an impressive 4.9-star rating from 1,373 reviews, it has earned a reputation for excellence.

Durability

Built to last, this bag uses premium recycled materials. The 40L version features a 900D Recycled PET body, while the 30L model uses 910D Recycled PET, both offering a waterproof outer shell. The base is reinforced with 900D Recycled TPU, ensuring it can handle abrasion with ease. Metal buckles replace plastic for added strength, while waterproof seam bindings and water-resistant zippers keep your belongings dry. Every component is rigorously tested to meet high durability standards.

"Every element of The Kit Bag is made with durable materials that are built to last. Where possible, we have used materials from recycled sources, but only where they have passed stringent performance tests. The body of the bag is made from waterproof materials, the seams have waterproof binding and we use water-resistant zips." – Stubble & Co

Storage Capacity

Designed to handle everything from daily gym essentials to extended travel, the bag comes in 30L, 40L, and 65L sizes. Inside, the recycled PET lining adds structure and makes cleaning a breeze. This thoughtful design ensures you can pack efficiently, no matter the occasion.

Comfort Features

Carrying the Kit Bag is a breeze, thanks to its adjustable shoulder straps that evenly distribute weight. Users frequently highlight its comfort and versatility. Josephine C., for instance, shared her experience:

"Great quality bag for gym and office. It’s comfortable to wear, roomy, sturdy and waterproof." – Josephine C.

Price (USD)

The Kit Bag is positioned as a premium option, with pricing as follows:

  • 30L model: $333
  • 40L model: $355
  • 65L model: $401

Though it comes with a higher price tag, the Kit Bag delivers on its promise of quality and eco-conscious design. As Timothy C. noted:

"Incredible bag. I reviewed thoroughly and this bag surpassed my expectations, which were high!" – Timothy C.

With its durable, waterproof construction, eco-friendly materials, and practical design, the Stubble & Co Kit Bag is a standout choice for those who value both performance and sustainability. Whether you’re heading to the gym or embarking on a trip, this bag has you covered.

5. Orca Transition Bag

The Orca Transition Bag wraps up our list, designed with multi-sport athletes in mind who need quick and efficient gear transitions.

Ventilation System

This bag features mesh panels that encourage airflow through the main compartment. These panels help reduce moisture buildup, allowing wet gear to dry faster. It’s a practical feature aimed at keeping your equipment fresher between back-to-back training sessions.

Durability

Crafted from tough materials and reinforced at key stress points, the Orca Transition Bag is made to withstand the wear and tear of daily athletic use. Its water-resistant coating offers protection against light rain and splashes, adding an extra layer of reliability for outdoor activities.

Storage Capacity

With a roomy main compartment, internal pockets, loops, and external storage options, this bag makes organizing your gear straightforward. Everything you need is within reach, making it easy to grab essentials on the go.

Comfort Features

The bag is designed with padded shoulder straps and reinforced handles to evenly distribute weight. Whether you’re carrying it on your back or setting it down, it ensures comfort and stability.

Price

The Orca Transition Bag strikes a balance between affordability and functionality. Its specialized features come at a price point that makes it a practical choice for athletes who want quality without breaking the bank.

Every element of this bag is focused on streamlining transitions and keeping your gear organized, making it a smart pick for anyone juggling multiple activities. Whether you’re heading to the pool, the track, or the gym, this bag is built to keep up.

Pros and Cons Comparison

Lab tests have highlighted the strengths and weaknesses of each backpack, helping to pinpoint which one fits specific needs best.

FeatureBuilt For Athletes Pro Series 45LGymshark Sleek BackpackNike Utility Power Training DuffelStubble & Co Kit BagOrca Transition Bag
VentilationExcellent mesh panels with airflow channelsGood breathable fabric zonesSuperior multi-zone ventilation systemModerate mesh insertsGood mesh panels for moisture control
DurabilityHeavy-duty construction, lifetime warrantyPremium materials, reinforced stitchingMilitary-grade fabric, water-resistantSolid build qualityTough materials, water-resistant coating
Storage Capacity45L with multiple compartmentsCompact design with smart organizationSpacious with convertible layoutGenerous main compartmentRoomy with specialized pockets
ComfortErgonomic straps, padded back panelLightweight, comfortable carryAdjustable straps, balanced weight distributionPadded handles and strapsEven weight distribution, reinforced handles
Price RangePremium ($150-200)Mid-range ($80-120)High-end ($180-250)Budget-friendly ($60-90)Affordable ($70-110)

Let’s dive deeper into the trade-offs for each backpack to help you make an informed choice.

The Built For Athletes Pro Series 45L is a powerhouse for gym enthusiasts who need maximum storage and durability. With its heavy-duty construction and lifetime warranty, it’s perfect for those who carry a lot of gear. However, its large size might feel excessive for shorter workouts or casual use, and the price reflects its premium build.

Gymshark’s Sleek Backpack strikes a balance between style and function. Its lightweight design makes it ideal for daily commutes or quick gym sessions. The smart organizational features are great, but its compact size may fall short for those needing extra space for extended workouts or additional gear.

The Nike Utility Power Training Duffel stands out for its versatility. Its convertible design transitions seamlessly between duffel and backpack modes, making it adaptable for various needs. However, this comes with a steep price tag, and the multiple carrying options can be a bit confusing to new users.

The Stubble & Co Kit Bag offers excellent value for its price. It’s well-built and budget-friendly, making it a solid choice for athletes who want quality without breaking the bank. That said, its ventilation system isn’t as advanced as higher-end options, which could be a drawback for those regularly carrying damp or sweaty gear.

Finally, the Orca Transition Bag is tailored for multi-sport athletes. Its specialized compartments make it easy to organize and access gear quickly, which is a huge plus for triathletes or those juggling multiple activities. However, if you’re focused on just one sport, some of its features might feel unnecessary.

Ultimately, the right choice depends on what you prioritize – whether it’s storage, comfort, durability, or price. Each of these backpacks has something unique to offer, so think about your specific needs before deciding.

Final Recommendations

When picking the right gym bag, it’s all about finding one that aligns with your training habits and lifestyle.

For dedicated athletes, the Built For Athletes Pro Series 45L is a solid choice. Its spacious 45L capacity can handle all your gear, and the ventilation system helps keep things fresh, even after intense sessions.

If you’re looking for something budget-friendly but reliable, the Stubble & Co Kit Bag delivers durability without breaking the bank. While it doesn’t have advanced ventilation, it’s still a dependable option for everyday use.

Commuters and casual gym-goers might prefer the Gymshark Sleek Backpack. It’s lightweight, compact, and designed with smart organizational features, making it easy to store in your car or under your desk. Perfect for squeezing in a workout before or after work.

For those juggling multiple sports like swimming, cycling, and running, the Orca Transition Bag is a game-changer. It offers specialized compartments and quick-access pockets to keep all your gear organized and within reach.

Need something versatile? The Nike Utility Power Training Duffel stands out with its convertible design, making it just as practical for a weekend trip as it is for a hardcore training session.

Both the Gymshark Sleek Backpack and Stubble & Co Kit Bag strike a balance between functionality and convenience. If you carry a lot of gear, opt for a larger capacity bag. On the other hand, compact options are ideal for those who prioritize portability and efficient organization.

Higher-end bags often come with better airflow systems, which help minimize odors over time. Think about your gear volume and workout style to find a bag that enhances your routine while keeping things practical.

FAQs

What should I look for in a ventilated gym backpack?

When picking a ventilated gym backpack, focus on breathable features like mesh panels or airflow systems to help minimize sweat and odor. These designs make a big difference, especially after intense workouts. Comfort matters too – choose a bag with padded straps and ergonomic back panels to make carrying it around more comfortable, whether you’re heading to the gym or running errands.

You’ll also want to consider size and storage. Make sure the backpack is spacious enough for your gear, with compartments to keep everything organized. Durable materials are another must-have for a bag that can handle regular use. The ideal gym backpack strikes the right balance between functionality, comfort, and durability, making it a reliable companion for your active routine.

How does a gym backpack’s ventilation system help control odors and moisture?

A gym backpack with a ventilation system is designed to keep things fresh by encouraging airflow. Features like mesh panels or small openings allow air to circulate, helping to minimize moisture buildup. This is key in stopping odor-causing bacteria from thriving.

By keeping the inside dry and fresh, a ventilated backpack doesn’t just tackle bad smells – it also helps maintain a cleaner space for your gear. This is a game-changer for anyone who frequently hauls sweaty clothes, damp towels, or worn-out gym shoes.

Why would someone choose a premium gym bag like the Stubble & Co Kit Bag instead of a more affordable option?

A high-quality gym bag, like the Stubble & Co Kit Bag, offers plenty of space with its 45-liter capacity, built to handle all your gym essentials effortlessly. Crafted with durable materials and featuring a smart design, it’s perfect for staying organized and looking sharp, whether you’re heading to the gym or going about your day.

Though these bags may come with a steeper price tag, they deliver undeniable perks. Think long-lasting durability, generous storage space, and even odor control features – all of which make them a smart choice for anyone who values both practicality and style in their fitness gear.

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