This waterproof, clear toiletry zipper bag is TSA approved, and more durable than a ziploc bag. The squared-off shape and thicker plastic makes it easier to fill with liquid containers. Amazon sells them for [amazon_link asins=’B01L9VB610′ template=’PriceLink’ store=’boingboing’ marketplace=’US’ link_id=’2cbac7a6-9d54-4428-a543-2c270dd9352f’]. I bought two.