Aulumu B01: The Urban Tech Brand's First-Ever Sling Is a Modular 2.5-3.5L Game Changer

Aulumu launched in 2022 and has built a name for itself quickly with left-of-center tech accessories and urban EDC gadgets — the kind of gear that integrates into your life rather than asking you to rearrange your life around it. Every release in its catalog feels like it has had years of design work behind it, which makes the brand's first-ever bag a moment worth watching. The B01 Urban Transit Gear Sling is Aulumu's debut in the bag category, and it lands as an affordable modular carry that earns the brand's usual praise.

The headline feature is the expandable storage compartment, which lets the B01 grow from 2.5 to 3.5 liters depending on what you need to carry. That range is precisely tuned for urban EDC: a phone, wallet, keys, a compact flashlight, a small knife, earbuds, a charger, and a few cables all fit comfortably, and the expansion handles the days you add a tablet or a light layer. The modular design means you can reconfigure the internal layout instead of digging through one open space, which is the difference between a sling that works and a sling that makes you wish you had a backpack.

Falling in line with Aulumu's signature sleek aesthetic, the B01 looks like nothing else in the budget sling category. The materials, the zipper hardware, and the strap system all get the attention to detail the brand is known for, and the silhouette stays low-profile on the chest or back rather than bulging like a fanny pack. For a first bag, it is a remarkably confident product.

Gear Patrol's take is direct: it is the affordable modular sling the EDC world has been looking for. The caveat is that modularity is only worth paying for if you actually reconfigure it — buyers who will never touch the internal organization can save money with a simpler pouch. But for anyone who carries a rotating set of gear, the B01's expandability turns a common frustration into a feature.