The Danish toymaker said in a statement that the new bags will begin appearing in LEGO boxes starting in 2021, as part of a $400 million investment into sustainability initiatives over the next three years. The bags have been in development for the past two years. "We receive lots of letters from children asking why we still use single-use plastic in our boxes, which inspired us to begin to make this change," said Tim Brooks, vice president of environmental responsibility at LEGO. "This is part of our ambition to make all our packaging sustainable by the end of 2025," he added.