We bought two of these for a recent trip to Europe, and this ended up being my favorite lock.  I didn't use it on my luggage but rather kept it in my purse for any occasion in which I wanted to lock my purse up during tourism.  I have a Vera Bradley purse, which is perfect for travel (it's the cross body bag), so I could pull the zipper close and thread this through the zipper and the strap loop for a secure closure.  The lock closer is flexible and twistable, so it has a lot of uses.  It's lengthy so you can use it on a variety of bags.  It is easy to reset, but for preventing pick pockets, it's just a matter of closing it and twirling the numbers.  Pick pocketing is a crime of "quick" opportunity, so it's unlikely that most pickpockets will fiddle with figuring out a combo while the lock is on a purse that is on your body, tucked under your arm, so you can feel comfortable going shopping and using your bag as a place to put smaller shopping bags too.  We did have to use this lock on one of her checked bags on the way home because we ended up checking a bag that we thought we were carrying on, and it did its job keeping our items intact and TSA didn't have an issue with it.