Super Jossanova Membrane 750ml Bottle; Elite's flagship bottle. No 'bite valve' just squeeze to drink. The advanced Jossa valve and sealable bottle top make this bottle absolutely leak-proof. Jossa membrane valve uses tasteless medical-grade silicon and delivers 47 ml per second with minimum effort. The cap fully disassembles for easy cleaning. 100% BPA-free construction. 100% BPA free bottle material resists bacteria and keeps your drinks tasting fresher for longer.