It's affordable without sacrificing features like two mesh water bottle holders, padded straps, ample zippered compartments, a padded laptop sleeve and a USB charging port to charge your phone on the go (power bank not included)
While it's perfectly acceptable to wear a mountain bike helmet when cycling to work, it may have extra features, such as a visor or a chin guard, that you don't necessarily need or want to pay extra for
That said, this superb design which has been copied exhaustively by other brands creates a light weight rotor where the arches distribute loads away from the rotor arm's base, therefore more material can be cut away while maintaining higher rigidity
Despite the temptation, avoid buying a used motorcycle helmet
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