Customized Sports Bottles, Kai Glass Bottle 18oz - Borosilicate & Bamboo, The Kai Glass Bottle is a clear, single-wall, borosilicate glass bottle wrapped with a soft-grip silicone sleeve.The Kai Glass Bottle features a secure non-slip base that fits most standard car cup holders. Single-wall borosilicate glass construction Silicone sleeve design for a comfortable grip Screw-on bamboo lid closes securely Non-slip bottom prevents spills and accidents Fits most car cup holders Do not freeze or microwave BPA-free ... #1626-44 $14.55/each.