Can you easily buy tampons outside of Colombo?

Pharmacies here mostly stock sanitary napkins because culturally, tampons are rarely used by local women. Big pharmacies in Colombo (like Healthguard) carry them, but prices are high.

Oh wow, thank you for the warning. I will dedicate a packing cube to them.

My girlfriend switched to a menstrual cup for our backpacking trip here, said it was the best decision ever for traveling in Asia.

I made this mistake. Had to take a 45-minute tuk-tuk ride from the beach to a massive hypermarket in Galle just to find one box of O.B. tampons. Bring your own supply.