I will be flying cross country with my EBF 5 month old for about 2 weeks around Christmas. I normally pump at work and also after she goes to bed. Should I take my Medela PISA with me for the trip? I won't need to pump often, but will need to once in a while as her grandparents will watch her for a few hours here and there. Or does it make more sense to buy a manual pump? Thanks!