The endless use pouch. Every woman needs to own a set of these.
For toiletries, makeup, sanitary pads, beach - oh the options are endless. They also make such a lovely mom's gift.
Small (makeup): 4.5x7.5 inch / Medium (skincare) 5x8.5 inch / Large (toiletries): 5.5x10 inch
Note: can be customized.