I no longer have to bother with the swapping of lenses since I traded in a box of the things for the fixed-lens Fujifilm X100S, but when I did I found that I never had enough hands to do it (for the record, I have the usual number of hands: two). If I’d been desperate enough, then, I might just have opted for the Spider Holster Large Pro Lens Pouch, a dork-tastic accessory which is nonetheless very practical.
Spider Holster Lens Pouch Hangs Off Your Belt Like A Dead Penguin