iStarUSABPN-2535DE-SA 1x 3.5 to 2x 2.5 SATA I/II/III 6.0 Gb/s Hot-Swap Drive Cage (Black) by iStarUSA

iStarUSA enclosures are the best. Seriously. Accept no imitations. My fav's are the 4x 2.5" SAS/SATA in single 5.25" bay that takes full-size 15mm enterprise drives, and the 1x 2.5" + 1x 3.5" in single 5.25" bay (also has USB3 and on/off switch