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Review: Vertx Siege 25L Tactical Backpack
Guns and Gear

Review: Vertx Siege 25L Tactical Backpack

Jimmie Dempsey
Last updated: September 26, 2025 3:56 pm
Jimmie Dempsey Published September 26, 2025
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Having worked as a men’s clothier for the better part of 40 years, my father bemoaned a type of customer he termed “the designer.” This was the kind of guy that would run his hand over a jacket and announce he’d buy it, but only if it were a slightly different color, made of a totally different material, or if it had a pocket in one spot instead of another. “Unfortunately, I can only sell you what we have in the store,” he’d wearily reply.

The Vertx Siege 25L Tactical Backpack was tested for comfort, weight distribution and ease of carry during this review. Coyote model shown. Image: Vertx

While I understand my father’s eternal frustration, I think deep down just about all of us are “designers” at heart: we’re forever on the hunt for gear that doesn’t just meet our needs, but does so perfectly. We don’t want to carry around anything superfluous, and we’re hesitant to shell out our hard-earned money if we’re not getting the exact feature set we know will work for us. On top of that, I’d add that if you’re a reader of The Armory Life, you’ve likely accumulated enough gear to set the bar very high for any new acquisition.

Photo of a black Vertx Siege 25L Tactical Backpack leaning against a tree during outdoor field testing. The pack is upright, showing reinforced nylon fabric, MOLLE webbing, and multiple compartments. The 25-liter capacity is contained in a sleek, low-profile shape that blends well in outdoor settings. Padded shoulder straps and a breathable back panel are visible, emphasizing comfort for hiking or tactical use. The water-resistant material is designed to withstand weather and rugged environments. The scene highlights how the pack performs outside of urban settings. The review focuses on both tactical versatility and practical everyday use.
An attractive pack, the Siege 25L boasts a 550D Nylon MOLLE system on the front face for the attachment of additional pouches. Black variant shown.

Few brands seem to grasp this as intuitively as Vertx, and their Siege backpacks are almost tailor-made for the “designers” among us. I tested the Siege 25L pack — this is an excellent product right out of the gate, but I think the modularity of the platform makes this a home run.

On the Outside of the Siege Pack

The “25L” in the product name denotes that the pack has an internal capacity of 25 liters. For those of us who like a little more granularity in that figure, Vertx lists the dimensions as being 11.5” wide by 20” high. Depth is officially listed as 8.5”, but I’ve smooshed it down empty to a depth of 5;” fully packed out and lying flat on a table, I measured the maximum depth at about a foot.

Photo showing the rear section of the Vertx Siege 25L Tactical Backpack’s main compartment. The interior includes two sleeves designed to fit laptops, tablets, or soft and hard armor plates. A Velcro strap secures gear in place during transport. The loop-lined back panel provides modularity, allowing the use of Vertx Tactigami accessories for custom organization. The durable nylon lining is visible, emphasizing long-term reliability. This design balances tactical readiness with practical daily carry options. The image highlights flexibility for professional, outdoor, or everyday scenarios.
The rear of the main compartment has ample storage for just about any gear, including laptops and armor plates. A loop-lined panel aids modularity.

The Siege 25L is made from 330D Nylon for most of the exterior, with even tougher 550D Nylon forming the MOLLE webbing on the face of the external pocket. This ensures any gear hung off the system won’t cause it to sag. The exterior of the pack is water-resistant; I dumped several glasses of water on the Siege 25L to find that the liquid beaded up and ran right off the fabric, while the interior remained dry to the touch. Japanese-produced YKK zippers, long considered the gold standard in the apparel industry, ensure additional durability.

Photo of a Flat Dark Earth (FDE) Vertx Siege 25L Tactical Backpack fully kitted with gear and pouches. The pack is equipped with modular attachments inside and outside, showcasing its compatibility with Tactigami accessories and MOLLE webbing. Side pockets hold additional pouches and tools, while the expandable front pocket is in use. Straps and buckles are tightened to secure the load. The colorway blends well with tactical and outdoor environments. This setup illustrates how the pack can be customized for missions, range trips, or field use. The review highlights its modular storage capacity and rugged build quality.
A Coyote-colored Siege 25L kitted with accessories and external pouches. The pack demonstrates how users can customize for different missions. Image: Vertx

Speaking of zippers, you’re going to find a lot of them on the outside of the Siege 25L. The main compartment has four pull tabs, allowing the user to easily open the backpack from the bottom on either side for easier access to the lower-most contents. Along the main compartment and EDC pouch, the zippers have overlapping rings so they can be securely locked. Additionally, the EDC pouch comes equipped with one of Vertx’s rapid access tabs, ensuring you can retrieve what you put in there quickly.

Close-up photo of the Vertx Siege 25L Tactical Backpack’s YKK zippers designed for durability and security. The image shows two zipper pulls with overlapping metal rings that allow a lock to be threaded through them. This feature helps protect valuables or sensitive gear stored inside the main and EDC compartments. YKK zippers are internationally recognized for strength and long life under heavy use. The reinforced zipper tracks resist snagging and wear, even under full load. This detail emphasizes the Siege 25L’s combination of tactical function and everyday reliability. The photo highlights secure compartment access during testing.
Double-locking YKK zippers are used on the pack, offering durability and ease of use. Image: Vertx

I found the Siege 25L to be remarkably comfortable, even on long hikes. The straps and rear of the pack have some very generous mesh padding that was comfortable and breathable without being obnoxiously squishy or bulky. The backpack also features a waistband with quick release buckles, as well as a buckle that can secure the straps together across one’s chest. There are also a whole lot of straps underneath the Siege 25L that be used to secure a bedroll or other gear. If you want to pack densely, there’s a lot that can help you out.

Photo of the Vertx Siege 25L Tactical Backpack in Wolf Grey colorway. The 25-liter pack is shown upright, with reinforced MOLLE webbing, expandable front pouch, and durable nylon construction. Padded shoulder straps and a ventilated back panel are visible, providing ergonomic comfort. The discreet grey finish avoids overt tactical styling, making the bag well-suited for both urban commuting and outdoor use. Water-resistant fabric and YKK zippers highlight durability. The design supports modular organization with loop-lined compartments for Tactigami accessories. The image emphasizes a subtle aesthetic paired with tactical functionality.
The Vertx Siege 25L, shown here in Wolf Grey, offers a good balance of functionality and subtle styling. Image: Vertx

Before we move “inwards,” I’d also like to mention the aesthetics. I’ve always been a little leery of kit that announces, “Hey, world: there’s probably a gun in here.” The fewer people who know about my business, the better. In its default configuration, and in the black colorway, I found the Vertx discrete enough to pass the eye test of regular folks as being just a cool-looking backpack, and I never felt like I was crossing the line into military cosplay. Form definitely follows function here. It’s also offered in Wolf Grey and Coyote color options.

Pockets Galore from Vertx

Once again, I was blown away by the amount of space on the default pack that was available and adaptable for however I needed it — and we’re still just talking about the outside.

Close-up image of the Vertx Siege 25L EDC pouch opened via a rapid-access pull, revealing a Springfield Hellcat Pro 9mm pistol seated inside the loop-lined pocket. The black pouch interior and Velcro-lined surfaces show how the handgun and a hook-backed holster can be secured for retention. Visible zipper pulls and overlapping rings indicate the pouch can be locked for transport. Padded fabric and reinforced stitching around the pouch suggest durability for everyday carry and travel. The photo demonstrates how the pack supports concealed carry while allowing fast access when needed. Keywords: EDC pouch, rapid access, Hellcat Pro, concealed carry, loop-lined pocket.
At the heart of the pack is a central EDC pouch with a modular rapid access pull system. If you’re interested in off-body carry, the Siege 25L makes for an intriguing platform.

One of the main attractions of the pack is the central EDC compartment. Though you can set it up for any purpose you’d like, it’s clear that Vertx has primarily designed the pocket to store a handgun. The inside is loop-lined, so it will accommodate a wide variety of hook-backed holsters to keep your firearm in place. Vertx also sells a Velcro-backed belt-adapter panel to allow just about whatever rides on your hip or by your appendix to work in the pocket and stay aligned how you wish.

Two additional features I quite liked were the expandable front and side pockets. Both are made of a stretchier material than what’s found throughout the pack; the front panel can be expanded to fit a pair of boots, a full-sized jacket or even a helmet. The side pockets are also expandable and have buckles on the sides of the pack to secure longer objects; though this will work great to stow a variety of rifles, I found it was the perfect storage space for a full-sized tripod. (Most will likely use at least one side pocket as a home for a water bottle.)

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As if the Siege 25L wasn’t already feature-rich, there’s a zippered pocket at the top of the pack that’s soft-lined for shooting goggles or sunglasses, and both straps feature their own compartments that would be a great place for a knife, flashlight, spare magazine, or routing for a hydration system. Like the EDC compartment, it’s a great place to locate any kit you want close at hand.

Inner Beauty

Once again, “rapid access” is the recurring theme of the Siege 25L pack. The zipper has been designed so that the pack can be placed flat on its back, whereupon the user can open the front flap outward nearly 180 degrees. If you’re not the type that likes to go digging for something in your backpack — or if you’re a first responder who simply doesn’t have a few minutes to dither about to find an essential piece of kit, I think you’re really going to like the design.

Photo of the inner front flap of the Vertx Siege 25L Tactical Backpack showing its organizational layout. The panel features elastic loops large enough to hold tools, flashlights, or even a subcompact pistol. A zippered mesh pocket with a loop face provides secure storage for smaller items. Several pen-sized sleeves are aligned for writing utensils or slim tools. The layout highlights modular design intended for everyday carry, tactical use, or travel organization. The durable nylon interior and reinforced stitching suggest long-term reliability. This section of the backpack emphasizes rapid access and efficient storage of essential gear.
An inner shot of the front flap of the Siege 25L; a near-180 degree opening allows easy access to kit. Image: Vertx

Starting with the rear portion of the inner compartment, there are two sleeves, two pockets, one zippered compartment and one velcro strap. The sleeves are great places to store laptops or tablets, but they can also be used to store soft or rigid body armor panels. In fact, Premier Body Armor makes a Level IIIA Ballistic insert that fits the specific dimensions of the Siege 25L.

Moving to the inner front flap, the Siege 25L once again provides ample storage; there’s a large zippered pocket with a looped face, along with pen-sized storage compartments and a series of elastic loops. While not the primary function, I found the loops were large and sturdy enough to hold a subcompact pistol in place.

“Designers” Welcome

What really sets the Vertx Siege line of packs over the top is the way they play host to the brand’s “Tactigami” line of accessories. The plethora of loop-lined surfaces within the Siege 25L offer a playground for customization, allowing you to store knives, magazines of all shapes and sizes, laptops, documents and miscellaneous pouches full of parts any way you’d like. Vertx even offers standard and full-sized magazine and kit holsters (MAKs for short), which can be uniquely wrapped around the non-standard items you’d like to securely carry. For example, I was able to use the full-sized kit holster to craft a nifty little custom pouch for an Anker iPhone charger; I assembled it in under a minute, and a rubberized insert even provides tension to keep the gear in place.

Close-up photo of the Vertx Siege 25L Tactical Backpack showing padded shoulder straps and a ventilated mesh back panel. The padding is thick enough to provide comfort during long periods of wear but not overly bulky. Adjustable straps with quick-release buckles are visible, allowing users to customize fit. The mesh fabric increases airflow to reduce heat buildup during extended use. This design makes the backpack suitable for hiking, range days, or daily commuting. Reinforced stitching ensures durability under heavy loads. The photo highlights the comfort-focused construction of the pack.
The pack is designed for maximum comfort and ease of use. Note this padding designed to ensure comfort against the user’s back.

I also found the medium Tactigami pack organizer to be excellent for range trips. The square dimensions just about perfectly accommodate three boxes of pistol ammunition and a handful of magazines. Add a few pouches for rags, gun oil, various multitools and Allen wrenches, batteries, and miscellaneous spare parts, and you’ve got everything you need to keep your guns running even if weird contingencies arise.

Because everything’s Velcro, you can attach and detach all of the accessories to your heart’s content. Even among us “designers,” sometimes the quest for a perfect configuration involves trial and error. If something’s no longer working for you, or to adapt the Siege 25L to a new mission, just give a firm pull to any Tactigami pieces you don’t want and they’ll come right off.

Final Thoughts on the Siege 25L Backpack

Backpacks have come a long way from the time I was in college. Having taken the Vertx Siege 25L on quite a few trips since I first got it, I’m now a little embarrassed I spent so much of my life getting by with two pockets and two zippers. I have to admit, it’s pretty intoxicating to have everything I need exactly where I want it. I had a suspicion the Siege 25L would replace my previous rucksack when I looked over the features and spec sheet; I was a little surprised when I found it effectively competing with my range bag and camera bags for trunk time.

Photo of the central expandable pouch on the Vertx Siege 25L Tactical Backpack. The front pocket is made of stretch nylon that expands to fit larger items such as a helmet, boots, or a rolled-up jacket. Side compression straps with buckles are visible, allowing the user to tighten down the load for stability. MOLLE webbing is reinforced across the pouch face for attaching additional gear. The expandable design adds versatility without increasing bulk when not in use. The rugged fabric and reinforced stitching show durability for tactical or outdoor use. This photo demonstrates the backpack’s adaptability for carrying oversized equipment.
The central expandable pouch is a neat feature. Shown here, it easily holds two size 11 Timberland boots.

On top of that, I love that the Siege 25L looks cool without being overly conspicuous. Undoubtedly, we’re dealing with a backpack made to withstand the rigors of law enforcement and military operations — I, however, appreciate that the pack can be kitted out for a camping trip, photo shoot or a theme park visit without anybody really batting an eye at it.

The Siege 25L retails for $250.99 through the Vertx website. For the features, construction, modularity and thoughtful design, that strikes me as a real bargain. 

Editor’s Note: Please be sure to check out The Armory Life Forum, where you can comment about our daily articles, as well as just talk guns and gear. Click the “Go To Forum Thread” link below to jump in and discuss this article and much more!

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Featured in this article


Vertx Siege 25L Tactical Backpack

Vertx Siege 25L Tactical Backpack




Premier Body Armor Vertx Siege Pack Level IIIA/HG2 Backpack Insert

Premier Body Armor Vertx Siege Pack Level IIIA/HG2 Backpack Insert




Vertx MAK Full

Vertx MAK Full




Vertx MAK Band Standard

Vertx MAK Band Standard




Vertx MAK Band Full

Vertx MAK Band Full




Vertx Pack Organizer, Medium

Vertx Pack Organizer, Medium




Hellcat® Pro Series

Hellcat® Pro Series


Read the full article here

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