Sidel’s innovative NoBottle, which the company is pitching as a “water skin.” Unlike traditional half-liter water bottles which weigh in around 13 to 16 grams, Sidel’s NoBottle comes in at just under 10 grams. Sidel used its proprietary plastic technology, dubbed Flex, to make this new “water skin.” Because it is highly flexible and has shape-memory, Flex allows the bottle to spring back to its original shape upon being compressed or gripped in any way.