While I do most of my hiking locally, last year I flew to West Coast and my friend lent me a large duffel bag that was big enough for my backpack, bear can, boots and some other gear. This worked out great as everything arrived intact with no damage to my pack. I'm planning to fly again and I wonder if you have any recommendations for a bag like this that would be sturdy enough not to fall apart after two flights and would still be easy on my wallet. Thx!