Can I fit a single twin size mattress into the back of a Mazda Protege 2003?

yes you can.my mom used to have a 2001 which was older and we managed to fit one when my sister went of to college..it has to go in the back seat though not in the trunk.
 
yes you can.my mom used to have a 2001 which was older and we managed to fit one when my sister went of to college..it has to go in the back seat though not in the trunk.
 
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