16 secure pockets — zippered and flap-covered, plus a hidden inside pocket, so nothing falls out when you bend over
Feather-light, quick-dry twill — wear it over a t-shirt in July or over a hoodie in November
Two D-rings at the chest for glasses, hat or keys — grab them one-handed
Folds flat like a paperback — packs into any suitcase, wears through any airport.