Errant Sling X-Pac

Boundary Supply Errant Sling X-Pac — The 15L One-Shoulder Day Bag Built for Real Weather

The gist: A weatherproof 15L sling made from VX21 X-Pac laminate — the kind of material that shrugs off downpours — with enough structure to carry a laptop and a day’s worth of gear across a city.

• Stormproof zippers + X-Pac shell: VX21 X-Pac is waterproof, tear-resistant laminate used in sailing gear; paired with stormproof zippers, it handles serious rain without a separate cover.
• 14" laptop sleeve: Dedicated padded compartment fits a 14-inch laptop; the main compartment stretches to a 15-inch if needed, keeping the device separated from camera gear or clothes.
• Magnetic compression system: External magnetic pockets compress and secure the load; quick front-access pockets reach essentials without opening the main compartment on the move.
• Comfortable for city carry: At ~1.75 lb empty, a cushioned shoulder strap with a stabilizer keeps the sling from swinging on urban commutes or bike rides between hostels.

Urban Cred calls the Errant Sling “highly recommended” for urban commuters, praising its technical X-Pac build and waterproof zippers as ideal for biking or walking through city environments in any weather.

Best for: Nomads and city travelers who want a single-shoulder 15L that handles laptop, camera, and a day’s essentials through rain, transit, and long walks. Skip it if: The $319 price is outside your bag budget — there are dry-bag slings at a quarter of the cost for budget travelers who won’t use the X-Pac advantage. Check the current price before buying.