WTF’s Hydro Zip-On Back Panel 74.1 is designed to securely mount a hydration bladder and other essentials to your Crye Precision SPC.  In addition to the main compartment, there are two loop lined pouches, two 2 x 3 PALS on either side, and 2 x 3 PALS on the bottom.  A VELCRO® Brand ONE-WRAP® loop as a universal bladder hanger for use with Source Kangaroo, WLPS, and ILPS bladder and CamelBak’s 70oz and 100oz short bladders. To discourage inadvertent separation from the carrier, zipper pull tabs tuck securely and silently into milspec elastic loops to prevent the slider from riding upward.

Back Panel 74.1 uses MIL-DTL-32439 500D nylon, A-A-55126 nylon hook & loop, A-A-59826 bonded nylon thread, MIL-W-5674.1 nylon elastic, A-A-55634 spec heavy duty zippers, and well compensated, skilled labor to produce a cost effective part.

Back Panel 74.1 for SPC (size medium) is lightweight at just 9.9oz / 280g (size medium).  Approx 6 liter volume (approx 4.5 liter main compartment, approx 1 liter in the larger pouch, and approx 0.5 liter in the smaller pouch). 

Made in the USA with Berry and NIR compliant nylon fabrics.  Bladder not included.

Bladders, additional pouches, plate carrier, etc not included.

wtfidea.com

*Crye Precision, Source, and CamelBak do not endorse this product.  All trademarks, brands, etc are property of their respective owners.

CINCINNATI, Ohio (March 27, 2025) – Vertx, a leading manufacturer of cutting-edge tactical and everyday carry (EDC) bags and gear, is breaking new ground with the launch of the Siege Overt EDC bag series—designed for those who demand more from their gear. Known for crafting low-profile bags that allow you blend in with ease, Vertx now steps boldly into the overt carry market. The Siege series offers two robust pack sizes: a 25L backpack and a 15L sling. Available in Coyote, Wolf Grey, and It’s Black, these bags are ready to meet the demands of any mission.

“The Vertx customer knows our unmatched covert carry bags and slings,” said Erin Chrostowski, Product Line Manager at Vertx. “The Siege Series is something new our loyal customers have been craving for years. However, we didn’t just want to replicate what’s out there; we aimed to infuse it with Vertx DNA, crafting a top-tier overt bag. Our mission? To introduce Vertx to those who haven’t yet experienced our seamless adaptability, rugged durability, and everyday functionality. And for our current customers? This is the bag you’ve been waiting for.”

The Siege Series is equipped with the Vertx DNA their customers know and trust: light-colored interior that keeps gear visible in low-light environments, high-quality abrasion-resistant materials, mesh pocketing, hook-and-loop interior, and armor compatibility. But that’s just the beginning. The Siege backpack and sling come loaded with their own unique features:

Rapid-access EDC compartments to always keep your gear quickly accessible.

Expandable front pocket faced with tough 500D laser-cut MOLLE to increase your storage capacity without compromising durability.

Spacious main compartment with built-in admin storage and double-layered tech sleeves to keep everything organized and ready for deployment.

Available in three tactical colors: Coyote, Wolf Grey, and It’s Black – these packs are as versatile as they are reliable.

“Our goal when developing the Siege Series was to provide customers with something they haven’t been able to get from Vertx before – an overt pack option – which still provides the same quality our loyal supporters have come to expect thanks to the Vertx DNA,” added Anne Thurman, VP of Product Development at Vertx. “We’re proud of the way Siege is another example of Vertx’s continued industry leadership and innovation in the EDC space.”

Siege the mission and stay Ahead of What’s Next – shop now at www.vertx.com or find the nearest Vertx dealer to experience the difference firsthand.