For a mask that’s incredibly small, lightweight and easy to use, try AirFit P10.
 
Product highlights:
Nasal pillows cushion provides stability so the mask doesn’t move around when you switch sleep positions
Slip-on headgear is simple to put on and allows you to watch TV or read in bed while wearing the mask
Only three pieces makes assembly, fitting and cleaning a breeze
QuietAir vents reduce sound to only 21 decibels 1 – quieter than a soft whisper