The tour operator has pledged to offer all its travellers to the islands a reusable bottle from January 1, 2019.

Plastic bags were outlawed on the islands in May and plastic bags on Thursday (July 26).

And as of February 26 next year, non-returnable plastic bottles of any description will be banned too.

G Adventures operates more than 30 land and sea Galapagos itineraries.

Managing director Brian Young welcomed the move, adding plastic waste had reached ‘critical levels” globally.

“As a responsible tour operator, we have more responsibility to protect our planet than ever before," said Young.

"We already encourage travellers to bring reusable water bottles with them on their trip, and are fortunate with our office in Quito [Ecuador], it is logistically feasible to provide reusable water bottles to our travellers departing to the Galapagos.

“All our boats are fitted with filtered water in refillable tanks, and hotels supplying accommodation for our land-based travellers will also offer this service.

“The Galapagos is one of the most eco-friendly destinations we travel to, and we’re very happy to support them in their continued mission to keep their waters clean.”