I must say, I do travel with an extra container most of the time but not for the purpose of replacing someone else's. I merely travel with it in case I find a good place to hide it, which I'm too nervous to do, especially after reading about terrible cache hides. I hid 3 in my hometown as a noob and I admit they aren't the greatest. One was in an absolutely horrendous spot! I'm thankful for the cachers who alerted me to when it went missing from a flood and when the 2nd container was drenched inside. My caches are like my babies and I feel responsible to keep them clean and happy. If only everyone felt that way.