TSA-approved locks
Most folks know that bags are inspected at airports and, if necessary, checked bags are opened. If a bag is locked, the Transportation Security Administration (TSA) may chop the lock off, unless it is a special TSA-approved lock which they can open. These special locks are available at TravelSmith, Sharper Image and the like, usually for $10 and up.
I found TSA-approved locks in the hardware department at Wal-Mart: four to a package for about $8, keys included. Packs of two were available for a bit more per lock.
Further, Wal-Mart is the only place in my small town where I can find water-purification kits (drops or pills).
FRANK LAMSON-SCRIBNER
New Smyrna Beach, FL