Greenroom136 MetromongerDX Review: The Ultimate 12L Tactical Sling?

A Sling That Wants to Be a Command Center

The Greenroom136 MetromongerDX is a 12-liter sling built to carry far more than its footprint suggests. It handles a laptop, a full load of tech, and a wall of external attachment points, all wrapped in a distinctly tactical package. Here's a closer look at how it's built, how it organizes gear, and who it makes sense for.

Build and Materials

The version reviewed here is finished in Multicam Black X50 fabric, part of an exclusive edition that shipped in limited quantities. Greenroom136 also offers the Metromonger DX in Cordura and EPX fabrics in other colorways, which are the versions currently available.

Key construction details called out in the review:

• Dimensions: roughly 12.9 x 9 x 6.3 inches
• Lining: upgraded silver lining in approximately 420D ripstop
• Zippers: YKK #10 luggage-grade zippers, DWR coated (not reverse coil)
• Back panel: breathable, foamed mesh for comfort
• Grab handle: included, and swappable for other color options

The overall feel is premium, with attention to the smaller touches. The reviewer customized several elements, including upgrading a buckle to an Alpine buckle and adding aftermarket zipper pulls.

Organization

Capacity is where this sling earns its "command center" description. Even fully loaded, the reviewer noted there was still room to spare.

Front Panel and Exterior

• A hook-and-loop patch panel, approximately 5.3 x 3.5 inches, for morale patches
• Non-stretch webbing on the front for hanging tools, flashlights, or multi-tools
• Side webbing with roughly two inches between stitch points for clip-on gear
• Bottom external carry straps with two D-rings, suitable for a water bottle or jacket
• A magnetic hub system on the side for additional external attachments

Front Pocket

The front pocket includes the silver lining with a D-ring and key leash, two pen slots, and two fabric mesh pockets. The reviewer describes this mesh as more of a fabric than a stretchy mesh, which holds items in place well. It comfortably held a gaming console, wipes, a hank, pens, a keyring with an AirTag, charging cables, and other small items.

Main Compartment

The main compartment uses a clamshell (hatch) opening for full visibility. Features include:

• Matching silver-gray ripstop lining
• A large central cavity
• A zippered mesh pocket with a center stitch, effectively creating two pockets under one zipper
• An optional floor pad add-on for extra bottom protection (not included by default)

The reviewer packed cables, a power bank, an inflatable pillow, a laptop charger, earbuds, and small pouches with room left over.

Tech Compartment

The dedicated tech compartment is lined with corduroy, a signature Greenroom136 material. While the brand lists support for up to a 14-inch MacBook Pro, the reviewer's practical take is that a 13-inch MacBook fits very nicely and expressed doubt about fitting a full 14-inch device comfortably.

Hidden Back Pocket

A back pocket with a secret compartment, borrowed from the brand's Quick Drop Pro design, offers a discreet spot for passports or items you don't want exposed when opening other compartments.

Comfort and Carry

The strap system pairs a padded shoulder section (about three inches) with roughly two inches of webbing, using the same breathable mesh as the back panel. Additional details:

• Removable strap system via attachment points
• Extra D-rings on both sides for external carry
• A Fidlock stabilizer strap, included with the pack, that attaches to one of the bottom D-rings for added stability when biking or cycling

The reviewer has used it for short travels and considers it a strong contender for an upcoming trip. As with any high-capacity sling, the more you load it, the heavier it gets.

Who It's For

The Metromonger DX suits people who want maximum organization and modularity in a sling form factor, along with laptop carry. It's well suited to casual and travel use, hiking, jogging, or errands.

The main caveat is its look. The pack leans heavily tactical, and it's physically large. That aesthetic works for casual and travel settings, but the reviewer notes it may not be the best fit for a traditional office environment, despite the built-in laptop compartment.

If you want a feature-dense, highly moddable sling and don't mind the tactical styling, this is a standout option, one the reviewer places alongside Evergoods and Goruck as a favorite brand while noting the Metromonger's feature set is unique to Greenroom136.