FYI - Walmart.com sells gig bags for Casio keyboards. Having read about the zipper failure on the more expensive Hammond gig bag I bought one for about $28 that fits the SK-1. I have it in hand & will use it tonite. It seems to be reasonably built with (2) large pockets . Will let you know how it holds up.. .....
http://www.walmart.com/ip/World-Tour-Deluxe-Keyboard-Gig-Bag-for-Casio-CTK2100/15048513