Platypus plusBottle (1.0L) Based on the supreme versatility of the original Platy bottle, we"ve upgraded the Platy-plus bottle to make it the finest one-liter vessel on the planet. First, we created an all-new film that is softer and more flexible, yet even more durable for added value. We then added an all-natural, silver-ion based anti-microbial we call SlimeGuard TM , to help keep our taste-free films gunk-free too. Together with a more ergonomic shape and a handy carry loop, you just won"t find a better bottle on earth. Added Durability: New film is softer and more flexible, yet provides added durability for daily use. Easy Carrying: Tapered mid-section with new grab and hang loop makes drinking easy. Anti-Microbial Treatment: All-natural SlimeGuard antimicrobrial keeps your water fresh and taste-free. Collapsible: 80% lighter and more compact than an empty hard bottle of equal volume. Versatile: Allows you to attach different lids-even hydration tubes and accessories. Platypus awarded Best Hydration System Brand as voted by readers of Dandelion Magazine (now Women"s Adventure Magazine) in 2005.