here is a good blog post about pop tarts and how they compare to an average energy bar. and they really do fit nicely in a jersey pocket. too bad my stomach doesnt agree with them like my wallet does. see the 3rd post down - Ode to Pop tarts.
http://www.patrickevoe.com/...nd_Race_Reports.html
http://www.patrickevoe.com/...nd_Race_Reports.html