Welcome from CA. which bike are you on now, the 1300? We always like pictures around here when you can. And, you'll find a lot of help around here. On my 1100, when I need more room on the back for storage, long trip, I use T-Bags. Their decent but I wouldn't put a super high recommend as I'd rather have a hard trunk but that's a maybe some day...
2002 V-Star 1100
You don't stop riding when you get old, you get old when you stop riding
2004 BMW K1200GT
1995 BMW 1100 LT
1970 Honda 500/4
1969 Kawasaki 500HD - 3 cylinder rocket
1968 Yamaha 250