Grey aluminium refillable nasal inhaler.
Consider the environment, and buy a refillable nasal inhaler. Each inhaler comes with a glass inner shell with cotton wick. You simply add essential oils into the glass shell / bottle, then insert the cotton wick, then screw on the cap and insert it into the outer aluminium case. When you can no longer smell the essential oils, you simply add more!
Nasal inhalers are your portable personal diffuser. They are easy to make and use. You can take them anywhere. We love using them when travelling and for my kids for school. That way, we can inhale the aroma anywhere. They are particularly helpful when travelling on planes and on public transport when your conscience of small spaces and ventilation (and of course, other people).
(cotton wick not pictured)