Pumping on field trips

Torri • Wife, teacher, Mama, Baby girl Jan. 2018 🎀 Baby boy June 2019 👼🏻 Baby girl July 2020 TTC #4

As a teacher, spring time is full of field trips for us, which is great! However, I’m not sure how or when to pump on field trips. I can get plenty of supervision and have a battery powered pump, but where do I go for privacy when we spend most of our field trips in the great outdoors?