Here's what other sites are saying:
Slip the Amphipod Thermal-Lite insulator sleeve over your hydration bottle to help keep your drink hot or cold and add extra cushioning for comfort and protection. Grippy neoprene sleeve fits traditional round bottles as well as low-profile bottles. Slotted sleeve design is easy to put on and remove. Amphipod Thermal-Lite insulator sleeve size Small fits 10 - 16 fl. oz. bottlers; size Large fits 16 - 24 fl. oz. bottles.
Where to Buy
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Guyot Designs SplashGuard
Platypus Bite Valve Cover
$3 - $5
Nalgene Insulated Water Bottle Sleeve
$7 - $16
Platypus Bite Valve and Drink Tube Insulator
$8 - $15
Nalgene Easy Sipper