Here's what other sites are saying:
Tried and True. Loop top for more carying options.
SIGG Screw Tops (also called SIGG Loop Tops) are their signature top. Take your SIGG anywhere by clipping a caribiner or spring hook through this top and away you go! SIGG Screw Tops come in an array of colors and will fit any size SIGG bottle you have. Made of PP, they are sturdy and long lasting. Now made with fewer threads so only a couple of twists will get you to your beverage quicker. About SIGG: SIGG has been designing and manufacturing water bottles since 1908 in their own factory in Switzerland - one of the greenest countries on the planet. In their continuing effort to raise the standard for environmental performance, they recently upgraded all of their quality procedures and processes. As a result, SIGG can say with even more confidence all ingredients used in their products are in conformance with both European and U.S. regulatory requirements. They are also certified and free of harmful chemicals. Furthermore, all ingredients inside their bottles are free of any volatile organic compounds (VOC's), Phthalates, BADGE, BFDGE, and NOGE. In particular, SIGG's ingredients are free of BPA. SIGG bottles are independently lab tested to affirm that their products meet their promise.
- Rocky Mountain Trail
Sigg's? Screw Top is leak-proof, even in the most extreme situations, thanks to an integrated seal. Popular with all friends of the outdoors.
Replacement cap for all Sigg Traveler Bottles (Campmor Item Numbers 80157, 80158, 80159, 80153), Earth Bottle (80153), Think Green Bottle (80154), Rise Above Plastic Bottle (80155), Sunray Bottle (80161) and Maha Bottle (80162).
Guyot Designs SplashGuard
Platypus Bite Valve Cover
Nalgene Insulated Water Bottle Sleeve
CamelBak Fresh Reservoir Filter
$15 - $19
MSR SweetWater Prefilter
$1 - $9
Osprey Hydraulics Cleaning Kit
$9 - $24
Ultimate Direction Kicker Cap