It could be lights out for tiny toiletries.

Marriott International, the world’s largest hotel chain, said Wednesday it will eliminate small plastic bottles of shampoo, conditioner and bath gel from its hotel rooms worldwide by December 2020. They’ll be replaced with larger bottles or wall-mounted dispensers (pictured), depending on the hotel.

The move follows a similar announcement last month by IHG, which owns Holiday Inn, Kimpton and other brands. IHG said it will eliminate about 200 million tiny bottles each year by 2021. Last year, Walt Disney Co. said it would replace small plastic shampoo bottles at its resorts and on its cruise ships. Many smaller companies, like the five Soneva Resorts in Thailand and the Maldives, have also ditched plastic bottles.

Marriott has more than 7,000 hotels in 131 countries under 30 brands, ranging from SpringHill Suites and Residence Inn to Sheraton and Ritz-Carlton. It says it will be eliminating about 500 million small bottles each year, or 1.7 million pounds of plastic.

Marriott has wanted to get rid of small bottles for years, President and CEO Arne Sorenson said. There are just too many of them, he said, and they’re difficult to recycle because of the time it takes to clean them out.

But it took a lot of work to design tamper-resistant large bottles and get suppliers on board. High-end hotels, in particular, needed to have bottles that still felt luxurious, he said.

Bethesda, Md.-based Marriott started replacing small bottles early last year at some North American brands, including Courtyard and Fairfield hotels. About 1,000 of those now feature larger bottles or pump dispensers that are hooked to the shower wall.

Denise Naguib, Marriott’s vice president of sustainability and supplier diversity, said Marriott got a positive response from guest surveys. Many were relieved because the larger bottles let them use as much or as little shampoo as they want.

“More and more people have a general consciousness of it,” she said. “They don’t want to be leaving half-empty bottles.”

Naguib said most Marriott hotels will eliminate small bottles by July 1, 2020. Luxury brands will get rid of them by the end of 2020. Lower-priced brands will have dispensers or bottles that are tethered to the shower wall. Luxury brands will have untethered bottles. The bottles hold the equivalent of 10 to 12 small bottles, and all are tamper resistant.