3 weeks in paradise X2 people who reapply constantly (and rarely burn

=
2-3 gallon size bags of the stuff. Yeah, maybe a little overkill, but a bottle of lotion + spray for each gear bag, variety of SPF's for different uses, spray runs out quick, etc. Not all spray, but lotions and such goes in the bag as well.
We do tend to split the bags up into 2 suitcases, unless mine is full and then takes all the stuff.

When we come home, the extra room gets filled up with rum.
FYI- Banana Boat has a great aloe after-sun lotion. Really helps after all the sun/sand/surf, and smells good.
Enjoy the beach- I still have 120 days to go.....