Just wanted to post a heads up for anyone who has a Lewis Clark combination double cable lock for your luggage. This luggage lock was recommended at a packing presentation I went to one time. (Not a RS one!). It has a slightly longer cable on one end that threads thru the suitcase handle plus a smaller one to run thru the zipper tabs. I got one for myself, my SIL and my brother.
We used them easily last year on vacation, so this year we were all set. However....after passing thru security in our first airport, the lock seemed to be jammed on my SIL's case. In our long layover in Seattle she could not get it off (yes she was using the right combo). She finally wound up at the Ex Officio store in SEATAC and they used scissors and finally worried it off. After we arrived in Dublin my brother's lock would not open and he had to borrow pliers from the hotel front desk to clip it off. The desk clerk indicated it happens weekly. Mine was still working so I was able to get it off and throw it away. We all had carabiners which we just switched over to the zipper tabs to keep them in place.
We don't really worry about people getting into our luggage if it is gate checked (nothing valuable in them), but just want for the zips not to come open. However, we will just stay with the carabiners from now on!