Here's what other sites are saying:
With a leash that means the cap won't go missing, the GSI Outdoors Microlite 500 Twist lid makes it easy to open your water bottle with mittened hands, thanks to its handy leverage-enhancing lobe.
Where to Buy
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Bison Designs Bottle Bandit
Yeti Rambler Tumbler Straw Lid
Guyot Designs SplashGuard
Platypus Bite Valve Cover
Nalgene Insulated Water Bottle Sleeve
$10 - $16
Platypus Bite Valve and Drink Tube Insulator
$13 - $19