Timbuk2 Tandem Pannier Bag Black
These two super-durable saddlebag pannier bags magically transform into a single shoulder bag. Thanks to built-in magnets, all traces of pannier-ness disappear when two halves become one. A 15" laptop pocket makes every commute a beauty. And while we can't say it's "waterproof" because you can't submerge it in a pool, its fabric-backed tarpaulin fabric makes it super duper water resistant.