How to choose the right 100% compostable bags?

In Vietnam, each family uses average about 1 kg of plastic bags/ month.

Hanoi and Ho Chi Minh City release about 80 tons of plastics and plastic bags everyday.

Currently, Vietnamese market has more than 40 manufacturers who listed on their product as 100% compostable bags.

However, the self-decomposed ability of these products is a difficult question to answer.

Among the countless bags which are advertised as compostable and safe for the environment, how to choose the right clean bag products?