Small bottles
Small perfume bottles for people who like mild scents
A small perfume bottle contains less liquid, not necessarily a milder fragrance. If gentle presence is your priority, evaluate the actual scent and application before using container size as a selection rule.
A HUME Fragrance buying guide

Separate amount from concentration
The millilitres describe quantity. They do not independently state the concentration or projection of the product. Read those descriptions separately and verify comfort with a trial.
Use the small format as a test
A tester allows a more limited commitment while you decide whether the fragrance feels comfortable. Pay attention to both the opening and the later scent.
Avoid spray-count assumptions
Different atomizers can apply different amounts. Do not assume a fixed number of tester sprays will reproduce the same application from another bottle.
Try this before you buy
Record the product and your comfort with its application; do not label mildness from the millilitres alone.