When dealing with heightened security issues in our day to day lives, the best way to carry your identification or security pass is on the end of any number of different lanyards. There is no shortage of different kinds of custom lanyards that can be as long or as short, as thick or as thin as you would like.
The average lanyard is a simple enough device. Made of any sort of material, whether rubber or string or a more tensile rope of any thing that can basically be made into the shape of two strings that hang from your neck or wrist and have some sort of contraption that holds an identification card or security pass on the bottom of the device. There is literally no end to the number of different looks that a badge lanyard keychain can have.
The purpose of these, despite the obvious function is so that the average person does not need to constantly dig in their pockets, purse or wallet in order to get access to that work pass. It is also easier for the security to see whether or not people who are in certain areas are actually supposed to be walking around those areas if they have their identification tags hanging around their necks as opposed to hidden in their pockets.
When in a high security area the seconds it takes to simply spot the ID as opposed to stopping someone, and asking for their pass, and waiting for them to dig it out can be very important both for the employee, and the employer. The different types and colors and sizes of lanyards can allow employees to show their own individual interests, or a company can make sure that everyone has the same type which can also be a way to tell who belongs and who does not.