Setting up this cologne duo is as simple as unboxing and preparing to spritz. No complex setup is required. The 9ml bottles are designed for easy portability and fit seamlessly into any travel kit or daily bag.Compatibility:- Skin: Suitable for direct application onto skin. If you have sensitive skin, consider doing a patch test first.- Layering: Fully compatible with each other and other Jo Malone London colognes or bath and body products for scent combining.- Travel: The 9ml size is generally compliant with airline liquid restrictions for carry-on luggage. Always check current regulations before flying.Care:- Storage: Store colognes in a cool, dry place away from direct sunlight and extreme temperatures. This helps preserve the integrity and longevity of the fragrance.- Handling: Keep the caps securely on when not in use to prevent evaporation and maintain freshness.- Cleaning: If the bottle gets smudged, gently wipe it with a soft, dry cloth. Avoid using harsh chemicals.- Shelf Life: While colognes do not typically expire like food, their scent can change over time. Using them within 2-3 years of opening is generally recommended for optimal fragrance quality.