This is NOT working...I need HELP

SO, the girls I am going to Europe with decided it would be a REALLY good idea if we all packed in carry-ons ONLY. Someone told them we HAD to do this (I wont' say who that was, but whatever I wasn't really up for this, but decided I would be a trooper and try. So, I did a practice packing a few weeks ago and thought I might could pull it off. I was kinda proud of myself. I tried to pack again today...for real. IT AIN'T HAPPENIN. NO WAY, NO HOW, NADA. Who knows what I am going to do. Its not the clothes, its the quart sized ziploc. AINT HAPPENIN. Any suggestions....