Theorem 30 Backpack

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A 30-liter daypack that blends functionality with unparalleled style, the Black Diamond Theorem 30 holds everything you need for life’s multi purpose missions. The internal organizer features a key leash and zippered mesh pockets, while the electronics sleeve can be accessed both internally and externally. Two external stretchy side pockets hold water bottles, climbing shoes or any other gear you need, while a front-mounted daisy chain adds attachment options. The main pack body is built from 100% recycled fabrics.


Black Diamond
Mfg Sku/Part Number:
One Size
Pack Volume:
30 liters / 1831 cu in
2 lbs / 0.9 kg
Recycled 840D Polyester and Mini Ripstop Nylon
Other Features:
  • 30-liter storage capacity—enough for a laptop, folders, organizer, extra papers, books, additional electronics and those extra items just in case
  • 100% Recycled body fabric—Eco-conscious BD Mini Ripstop combined with a 840d polyester create a new level of style and protection with 100% post-consumer recycled fibers made from discarded water bottles
  • Two stretchy but durable side pockets for water bottles, climbing shoes or other easy-to-grab gear
  • Internal organization with key leash and zipper mesh pockets
  • Externally accessed padded laptop sleeve with soft, electronic-friendly lining fabric
  • Large main compartment with fully featured internal organizer, padded electronics sleeve, and key leash
  • Separate front zippered accessories pocket with organization for pens and accessories
  • Reflective markings for visibility on commutes
  • S-curve shoulder strap shaping with dual density max comfort foams for breathable, all day carrying comfort
  • Padded backpanel with ventilated air channel combined with breathable air-mesh
  • Dependable and long lasting YKK zippers
  • Side compression straps to keep gear secure for when you’re on the move
  • Adjustable sternum strap

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