Storage guides
How to store eau de toilette
Store eau de toilette closed and protected from heat, direct light and unsuitable temperature changes, as the maker directs. An EDT label does not mean it can be kept in a car or sunny bathroom window.
A HUME Fragrance buying guide

Review the everyday location
Choose a stable place rather than a surface repeatedly exposed to sunlight or heat. Convenience should not override the product's actual storage information.
Keep the original identity
Retain the exact version name and packaging information. This helps distinguish an EDT from a related EDP and preserves useful product details.
Handle travel separately
Carry only what you need and return the main bottle to appropriate storage. A travel routine is not a reason to leave the whole collection in a hot bag indefinitely.
Try this before you buy
Check the location and exact version label of an EDT bottle before adding it to a daily carry routine.