Bags under eyes – Diagnosis and treatment – Mayo Clinic

The following tips can help you reduce or eliminate bags under eyes: Use a cool compress. Wet a clean washcloth with cool water. While sitting up, apply the damp washcloth to the skin under and around your eyes for a few minutes using mild pressure. Cut down on fluids before bedtime and reduce salt in your diet.

https://www.mayoclinic.org/diseases-conditions/bags-under-eyes/diagnosis-treatment/drc-20369931