ATM, I bought one some time ago for my 1988 Electra Glide. It has four pockets, with the two outer ones longer than the two inner. The pockets are about two inches thick and about four inches deep, which would leave plenty of room for the key, and gloved hands. It measures 22.5 inches overall with a mounting hole in the center and plus four others to match the 88 EG windscreen attachment screws. The newer Electra Glides have a three screw mounting system.
JC Whitney used to carry this one but the web site now shows one similar to RHD47s with three bags and three mounting points under the bags. The bags don't appear to be as heavy as RHD's though.
From looking at mine, it appears it would be easily adaptable to the Rocket. The dimensions are similar. Mine could be easily modified with new screw holes, if required, and grommets to fit the Rocket. Unlike the ones on the Whitney site, the holes are hidden either in the pockets or between them. I am going to my friend's shop this week and will look at his catalogs to see if it is still available. If I don't get over there, it won't be for three weeks. If you see one for an 88 model year with four pockets, that should work. Harley changed the windscreen in about the mid-90s. If I find one I will order it for mine and report back.