Here's what other sites are saying:
Thanks to a handy, leverage-enhancing lobe, the GSI Microlite 720 Twist lid makes it easy to open your water bottle with mittened hands. Plus, it has a leash that means the cap won't go missing.
Where to Buy
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Yeti Rambler Tumbler Straw Lid
Bison Designs Bottle Bandit
Guyot Designs SplashGuard
Platypus Bite Valve Cover
Nalgene Insulated Water Bottle Sleeve
$10 - $16
Platypus Bite Valve and Drink Tube Insulator
$13 - $19