Put one of those nylon straps on your bag like -
http://www.amazon.co....LUVJ0/ref=pd_sim_sg_3 - to keep it shut, should the locks, hinges or zips break. Get it personalised if you want - helps to id your bag on the carousel and also should your bag go astray, it may help filling our the pir [missing bag] form.
Don't spend a fortune on it. Having done 30+ years in & around airports, there's always a way into any bag. It's not worth spending more than a fiver - the strap can always be sliced open with a stanley knife. As others have said keep anything valuable/irreplacable with you [or don't take it on hols]