From Mono:

"We've seen it (and done it) hundreds of times: grabbing the bass out of the side of a partially unzipped case while standing up. We do this to save space, to save time, or to save our backs. This observation became the driving concept behind the Vertigo™, the world's first top-loading guitar case. The top loading feature might have been enough, but the Headlock® has been redesigned for automatic neck support. Then The Boot® was created, a rubber sole designed for unsurpassed protection against vertical drops. The game has changed."