I have one of those tube type hard cases, I bought it from three rivers. Its also pictured in the Bob Lee advertisement for this web site. I like it, but it’s expensive. You could save a bunch of money by making the same thing out of a PVC pipe. Just get a long (about 36") piece of 8" diameter PVC. Get one solid end cap and the other cap with a screw out top. Some 10 min epoxy and you have a hard case. You will want to make some limb and riser covers out of some old flannel sheets.
In my case I can easily store two complete take down bows or one bow, the quiver, extra strings, bowstinger, binos, and other accoutrements.