If you prefer the design of the Klean Kanteen Classic bottles but still want to take your Klean Kanteen on the trail, just pick up one of these small, lightweight water filter adapters. One end screws into the Classic bottle and the other end has a universal thread design that connects to most standard back country water filters.

Features:

• Lightweight and durable
• Universal thread design works with most standard backcountry water filters
• Interchangeable between all Klean Kanteen? Classic bottle sizes
• BPA- & toxin-free
• Dishwasher safe