New, Improved Version of a Classic Guitar Bag The designers and creatives at MONO consistently keep innovation at the center of their product developments, driven by staying on the pulse of the needs of real artists and real performers. In fact, many of the designers at MONO are musicians themselves! The Vertigo Ultra Acoustic Guitar Gig Bag represents a significant leap in design improvement on an already-great bag — the MONO Vertigo. With the Ultra, MONO added in the Freeride Wheel System — two rugged casters that let you really make time across the airport or stage. And because MONO knows you're in the game for the long haul, the Ultra features newly designed Load Lifter shoulder straps that make getting to the show even more comfortable. Going the extra mile on this bag, MONO also added reflective strips to the front of the bag for nighttime visibility when you