Upgrade your pour and shake your way to perfection with the Bartesian Boss Shaker. This insulated stainless steel shaker doubles as a tumbler, with an additional lid for quick enjoyment of your favorite drink on the go. Each set contains a shaker base, shaker lid, and tumbler lid, packaged in a premium gift box.  Volume: 20 oz. Premium Design: Leak resistant, rust resistant and double-lined for insulation, enjoy an exceptionally chilled beverage wherever you go. Easy Use: Press down to add lids, pull up to remove lids.  Care: Dishwasher safe. Pairs Best With: Cosmopolitan, Lemon Drop, Espresso Martini, Paper Plane, Aviation, Uptown Rocks, Hemingway Daiquiri, Sidecar, Lime Daiquiri, Jungle Bird, Bee's Knees, Penicillin, Raspberry Ginger Gimlet, Dirty Vodka Martini Subscriber Benefits: Save 50% on all accessories with an active monthly subscription (must check out using active subscriber email address)  Subscribe & Save Today