HydroJug Traveler 40 oz Tumbler. Meet your new favorite 40oz Tumbler. The HydroJug Traveler is completely leakproof with the straw down, cupholder compatible, and has a hygienic circular flip straw for easy sipping. Go anywhere and do anything with this durable, insulated and sleek hydration companion. With the triple wall insulation you can keep your cold drinks cold. Compatible with most cup holders. The rubber base helps to protect your surfaces. Imported.