Roll on glass bottle for perfumes, essential oil blends or even lip gloss.  Not much larger than a standard sized  lipstick so it is easy to fit in your purse or pocket.  Bottles come in 3 pc: vial, plastic roller ball, cap.  After filling insert roller ball with slight pressure and then cap.

These bottles hold .35 oz of fluid

Bottle dimensions: 3 3/8 x 3/16