This military hydration water bladder is constructed from high quality olive green PVC with built-in Microban antimicrobial protection which keeps this product cleaner and fresher by inhibiting the growth of bacteria that cause stains and odours in other bladder products. Also features a neoprene insulated drinking tube, wide mouth opening (for quick filling/emptying and easier cleaning and drying), secure non-leaking screw down lid and simple on/off bite valve. Compatible with most makes of water bladder holder. Weight: from 270g (empty). Colour: olive green. Size: 2.5 litres or 3.0 litres.