Just joined the Kemper Community, My pre-owned Kemper came with an Anvil Road Case. I don't gig so that was a bit of over kill. I am a photographer and had a LowePro bag that looked about the same size and it was a perfect fit. See pics.
These Lowepro AW bags are pricey new but can be routinely had used for $50-$75 . The Magnum AW is the one I have, which happened to be a green that was a close match to my toaster, a previous model that is similar is the Commercial AW . These are All Weather bags, but I wouldn't throw them in a swimming pool. There are different sizes so check to make sure its the size that fits your Kemper. LowePro is a quality camera bag mfr., no I don't work for them, just like their stuff and that it fit.
Hope this helps someone.