I went for a home made 100mm PVC pipe with screw cap on one end, it's pretty tough and has made a few flights between Perth and Nhulunbuy.The last trip I found the glued end cracked so cut it off to fit another screw on cap. I drilled a hole in the edge of the caps for a self tapping screw to stop the caps coming off at the wrong time. It comfortably fits a 7ft rod plus a bit of foam at each end, and some bubble wrap for lengthways padding. 2-3 heavy popping rods would fit OK, but not 5 or 7...
Best,
Sam