The Store' Go USB Drive from Verbatim has a push and pull sliding feature which protects the USB connection when it is not in use without the need for a separate cap which is easily lost.
Verbatim VB-FD2-16G-PSB. Capacity: 8 GB, Device interface: USB Type-A, USB version: 2.0, Read speed: 10 MB/s, Write speed: 4 MB/s.