If you travel with a couple of lenses then you probably should invest in some solid protective measures for all that fragile glass. Incase's new Lens Cases are perfect for anyone with mirrorless camera kits who want to protect their gear while still traveling light. The cases come in four sizes and feature weather-resistant construction, removable inserts for custom sizing, and a strap attachment to secure it to your bag. 

$80-$90, incase.com