The PinStripe 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 seperate cap which is easily lost
USB 2.0 interface Push and Pull Sliding feature Dimensions: 54 x 21 x 9.22mm (L x W x H) Minimum Read Speed: 10MB/sec Minimum Write Speed: 4MB/sec Password Protection Software Trial available for download