Backpacks tend to be pretty similar to each other, but the new modular Arkiv Field Pack System from Mission Workshop gives you the ability to customize a bag to fit your needs. The bags are made with a 1000 denier nylon exterior and a weatherproof urethane coated nylon liner; “the pack is fabricated with military spec thread and waterproof urethane zippers, and is reinforced with an LDPE frame sheet for support and protection.” You select a Field Bag in the small (1200 cu. in., $209) or large (2200 cu. in., $229) size and in black or dark gray Cordura or waxed canvas ($30 option for bag, plus $6 each per accessory). Next, you add accessory pockets to make the bag your own: the Folio organizer pocket for pens and the like ($68), padded Laptop Case ($86), Tool Pocket ($58), Utility/Cell pocket ($28) for smartphones or cameras, Vertical Roll Top Pocket ($48) for cylindrical objects, like water bottles, or Vertical Zippered Pocket ($52). Bags may be pre-ordered now. Shipment is expected to begin on June 15, 2012.