Here's what other sites are saying:
Why carry a gaudy plastic water bottle when you can quench your thirst with the GSI Outdoors Microlite 720 Twist vacuum water bottle instead? Its 2mm-walled design is 1/3 lighter than other models.
Where to Buy
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GSI Outdoors Microlite 1000 Twist
GSI Outdoors Microlite 500 Twist
GSI Outdoors Microlite 720 Flip
Nalgene 32 oz Wide Mouth Tritan
Klean Kanteen Insulated Classic 20oz