Use notre/nos when on means we, but son/sa/ses when it means people (possessive adjectives)

On est son propre maître.One is one's own master 

On aime toujours sa famille.One always loves one's family. / People always love their family.

On mange notre repas.We are eating our meal.

On porte nos sacsWe are carrying our bags.

Possessive phrases containing on can use either : 

- son/sa/ses if on is used in a general sense (one, people)
or
-notre/nos when on means we

 

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Examples and resources

ON - "we"


On porte nos sacsWe are carrying our bags.
On mange notre repas.We are eating our meal.

ON - general meaning, "one"/"people"


On aime toujours sa famille.One always loves one's family. / People always love their family.
On est son propre maître.One is one's own master 
I'll be right with you...