Here's what other sites are saying:
Hydroflask Sport Cap - Narrow - Closeout - Our narrow mouth sports caps were designed with the mover and shaker in mind. The convenient pop top makes drinking on the go a piece of cake. We spent some serious time creating a sports top that fits your needs, the flow is great and the attachment loop makes it easy to clip your Hydro Flask to just about anything! The narrow mouth sports cap fits our 18oz. and 24oz. narrow mouth bottles.
- Massey's Outfitters
Hydro Flask Narrow Mouth Loop CapNewly designed for 2011, the new Narrow Mouth Loop Caps are now vented. This allows hot vapors to escape before and during closing the lid so as to allow them to close smoothly and cleanly.Perfect for everyday use, as well as the rigors of the outdoors, our Loop Caps provide a leak proof seal which aides in keeping your Hydro Flask contents cold or hot. Clip to a backpack or messenger bag and take your bottle on the road.Our Loop Caps are Patent Pending and made from polypropylene (PP#5), which means they are BPA-Free!
- River Sports Outfitters
Hydro Flask Narrow Mouth Sport Cap
Hydro Flask Standard Mouth Loop Cap
Hydro Flask Standard Mouth Sports Cap
$7 - $9
Guyot Designs SplashGuard
Nalgene Insulated Water Bottle Sleeve
$10 - $17
Platypus Bite Valve Cover
CamelBak Fresh Reservoir Filter