The Bullet Auxo 18oz Tumbler with straw features durable double-wall construction with built-in air insulation to keep your beverages hot or cold in any environment. It is designed to give you ultimate hydration versatility. Choose your method of drinking with ease, slide open the large closure for swig and slide open the small closure to insert the reusable straw for Sip. The Auxo includes a spill-proof press-on lid, together with an individual straw that is an eco-friendly, environmentally responsible, and sustainable alternative to disposable ones. Hand wash only. 18oz.