I use a large Blackburn at home, but in my current trip I chose to simply take a road morph I bought for that very purpose. BTW, CO2 are technically allowed in check in baggage, but tsa agents are too stupid to know it. I brough 4 in my current bike bag and they looked at it loosy and left it in place. You can always get some when you land wherever you are going. That Oenone easy thing to find. Also, if you are traveling with other riders, split the cost of a cheppo pump where you land and dump it at the end. Will be money well spent.