check this......I bought a Tribal Planet gig bag for an acoustic bass guitar for £10, from ebay.
I use just the back of an old gig bag I cut out, and place it between the two basses. Been doing this for over a year now. Basses are great, bag is still in good shape, and my wallet is still full of money!!
on the other hand - when I started to play bass ( many years ago ) there was no such thing as a gig bag.
So even carrying two about in seperate bags aint that awkward, is it!
all the best
S