What do you all use for your road bikes? These locks weigh around 4 pounds.

So far, everyone says that they don't leave their road bikes unattended. But what if you have to go to the bathroom. How do you fit your bike into the stall?
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2012 Specialized Amira Elite, upgraded carbon handle bars, Jett saddle 143mm switched to 145mm 2012 Selle Italia Max SLR Gel Flow saddle
2010 Santa Cruz Juliana with R kit and Crampon pedals
2011 Specialized Ariel Sport,suspension post,Serfas Rx Women's Microfiber saddle (sold)