pumping at work advice

Danielle
Ok- going back to work and here's my quandary... Is it easier to pump into the bottles I use for the baby ( which are
Glass and heavy) then naturally bring them daily to childcare....ORRR I am able to leave bottles with them. So just pump into whatever and combine the milk in one mason jar and have the nanny measure it out for each feeding? I'm sure I'm over-thinking this but I know you ladies understand!