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SERT x Alpha One Niner Penumbra 2.0 21L backpack in Black 1000D Cordura
Color

The Rugged Everyday Carry

Built tougher. Made for more.

A heavy-duty 21L tactical backpack made for daily use, gym sessions, training days, weekend hikes, and everything in between.

The toughest pack in our lineup, with the details that matter:

  • Rucking plate or laptop sleeve - fits the biggest 16" MacBook Pro
  • Stretch side pockets fit your largest Yeti tumbler or water bottle
  • Quick-access front pocket with loop panel for patches
  • Side CCW pocket compatible with hook-and-loop holsters like the V-Kit
  • PALS webbing for adding modular pouches and gear
  • Removable compression strap and webbing mounts on the bottom
  • Travel-ready hand-carry size - fits cabin baggage on most airlines

A rugged EDC backpack, gym bag, work bag, and weekend pack in one.

Upgrade your carry with our Fidlock V-Buckle sternum strap for one-handed buckling during training and rucking.

Weekend trip or training camp? Pack our AMBIT Dopp Kit inside for your toiletries.


Choose Your Colourway

  • Black - The everyday classic
  • Ranger Green - Rugged, low-key, all-terrain
  • Med Navy - Quieter, work-friendly, still tough
  • Tiger Stripe - Bold, military-heritage pattern
  • M81 Woodland - Classic camo for outdoor use
  • Gray - Modern, urban, neutral

Materials and Origin

  • 1000D Cordura nylon shell - one of the toughest pack fabrics in the world
  • 500D Cordura on the back panel and shoulder straps for comfort
  • 210D Ripstop Nylon lining
  • YKK reverse-coil zippers (#10 main, #8 pockets)
  • Premium materials from the US, Korea, and Taiwan
  • Hand-built in our own studio

Size and Weight

  • Volume: 21L
  • Height: 45.7 cm (18")
  • Width: 30.5 cm (12") at the base, tapering to 24 cm (9.5") at the top
  • Depth: 15.3 cm (6")
  • Weight: 1.42 kg / 3.14 lbs

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