This Victorianox travel wallet is well constructed using quality materials such as YKK zippers and most likely, Velcro brand hook and loop closures (not all "Velcro" is created equal).  Zippers and velcro is used throughout to secure internal pockets and card slots.  Pen loop inside.  Back of wallet has a wide mesh belt loop so wallet can be worn either across the body using the strap or looped through a belt.  The only criticism I have is that the plastic hooks that attach the string seem fragile, making the wallet less secure.  It would have been more secure if the string was looped all the way through the under side of the wallet flap.  However, if the strap were attached thusly, it wouldn't be removable.  A simple solution to that would've been to create a small pocket to tuck the strap in when using the belt loop.