Wide mouth makes it easy to fill without spilling Can be attached directly to MSR Waterworks and other popular water filters Rigid Eastman Tritan copolyester that is manufactured without BPA won't absorb tastes or odors Acid- and heat-resistant so you can pour boiling water directly into it without worry Convenient loop-top design means you'll never lose the lid For maximum longevity, hand wash in warm water with a mild dishwashing detergent