I've been able to get mine inside of the old Givi 52L top box, but have also bungled them across the front of the top box.
I also saw a guy with a simple and unusual idea for long pieces on each side of the bike. One was for tent poles and the other was a folding camp chair. For each, he had a piece of PVC water pipe with an end cap on the bottom, presumably with a drain hole or two. Each was mounted on the inside of the pannier mounts and he'd painted the PVC black to match.
I also saw a guy with a simple and unusual idea for long pieces on each side of the bike. One was for tent poles and the other was a folding camp chair. For each, he had a piece of PVC water pipe with an end cap on the bottom, presumably with a drain hole or two. Each was mounted on the inside of the pannier mounts and he'd painted the PVC black to match.