I bought one of these -
2 Bay Dual SATA USB 3.5" Hard Disk Drive Enclosure | Hard Drive - 3.5" | Buy Online Now!
Appearance is 'agricultural' - it's just a few bits of stamped metal, a fan and a small pcb but very robust and air holes everywhere. I had bought a cheaper one but it was fully enclosed and I could not see how it could keep the drive cool. Only USB and not complete SATA but fast enough for backups.