Colin Fletcher on Lenses

Spare camera lenses are heavy, cumbersome, fragile, expensive and dangerous . . . once you start carrying interchangeable lenses it is fiendishly to avoid becoming involved, far too often, in physical juggling and technical expertise.

Colin Fletcher, The Complete Walker

I’d argue that the damage can occur even if you don’t carry them. Just owning the damn things is a slippery slope. Same goes for multiple cameras.