The beautiful, realistic MailBass Mailbox has a weather resistant hand painted finish and is made of virtually indestructible polyethylene. More than 3 feet in length, the MailBass comes with a mailbox inside its belly, installation hardware and mounting instructions for easy installation on a common 4x4 wood post (post not included).
I have found it helpful to do the stretching exercises my physical therapist recommends. Do some core strengthening exercises, such as the ones highlighted at The Mayo Clinic. By keeping your core strong, your back won't put itself in a position to cause that sciatica pain you are having.