When it comes to external hard drive enclosures the 2.5-inch market is not that popular. Mainly because so many people use older 3.5-inch drives with 3.5-inch enclosures. The thing about 3.5-inch enclosures is that they are large and not easy to carry with you. The MB668U-1SB 2.5-inch enclosure from ICY DOCK is not only small and light it also allows you to install a hard drive with no tools at all. Another interesting thing about this enclosure is that not only does it have a USB connection it has an eSATA connection as well.