Klean Kanteen Classic with Steel Loop Cap
Silicone is only a gasket/seal — what touches your food is Stainless Steel (304 / 18-8).
The plain Klean Kanteen Classic bottle paired with the all-steel Loop Cap - the drink touches only 18/8 stainless, sealed by a single replaceable silicone gasket.
The verdict: Silicone only
The Classic bottle is 18/8 stainless steel, and the All Stainless Steel Loop Cap is a one-piece 18/8 stainless cap, threads included. Klean Kanteen markets it as a "100% stainless environment" inside the bottle, and the surface your drink touches is indeed all steel - but the cap is not gasket-free: it seals on a single replaceable silicone gasket, and Klean Kanteen sells replacement gaskets for it. So the honest rating is silicone-only - steel everywhere except that one silicone sealing ring, which is about as little non-metal as a leakproof cap gets. Applies to the adult Classic and the Kid Classic body, both narrow-mouth internal-thread.
Verification: Manufacturer confirmed
The Classic body and this one-piece stainless Loop Cap are sold separately; together they make an all-steel drink surface sealed by a single silicone gasket (silicone-only).
What it's made of
| Part | Material | Food contact |
|---|---|---|
| bottle body 18/8 (304) food-grade stainless; 90% post-consumer recycled on most Classic sizes | Stainless Steel 304 / 18-8 | Yes primary |
| cap (All Stainless Steel Loop Cap, one-piece) one piece of 18/8 stainless including the threads; the drink-facing interior is all steel | Stainless Steel 304 / 18-8 | Yes primary |
| cap gasket single replaceable silicone sealing ring inside the cap - the only non-metal part; Klean Kanteen sells replacements | Silicone | Yes seal |
The Classic is Klean Kanteen's original narrow-mouth single-wall bottle, made since 2004 and sold in everything from 12oz to 64oz. You drink straight from the opening - it's an open-mouth bottle, no straw or spout. The all-steel Loop Cap fits the narrow-mouth Classic and the Kid Classic body alike, so it's the plastic-free-purist pick for both adults and kids who don't need a spill-proof spout.
Pros
- One-piece steel cap, dishwasher safe; the only wear part is a cheap replaceable gasket
- Same cap fits adult Classic and Kid Classic bodies
- About as close to all-metal as a leakproof cap gets
Cons
- Standard Classic ships with a plastic loop cap; the steel cap is a separate purchase
- Open-mouth drinking only - no straw or spill-proof spout, so less kid-friendly for toddlers
- Not intended for hot beverages
- The silicone gasket can wear or loosen over time (it is replaceable)
Notes
- The All Stainless Steel Loop Cap fits Classic narrow-mouth bottles (internal threads) only, not wide-mouth
- Wide-mouth Classic/TKWide bodies use a different loop cap (Wide Loop Cap with Bale), also sealed on silicone
- Popping the gasket out gives a fully steel path, but you lose the leakproof seal
Categories: Water Bottles · Kids Water Bottles
Sources
Every material claim above is backed by these. This is the scattered info we centralized.
- manufacturer https://www.kleankanteen.com/products/stainless-loop-cap Klean Kanteen markets the Steel Loop Cap as one piece of 18/8 stainless creating a "100% stainless environment"; the marketing does not claim it is gasket-free, and the cap seals on a replaceable silicone gasket
- retailer https://www.amazon.com/Klean-Kanteen-Stainless-Bottle-Replaceable/dp/B0083F0RKM listing title is "All Stainless Steel Loop Cap ... Leak Proof Water Bottle Cap with Replaceable Gasket" - confirms the all-steel cap seals on a replaceable silicone gasket, not steel-on-steel
- manufacturer https://www.kleankanteen.com/collections/maintenance-kits Klean Kanteen sells replacement gaskets/maintenance kits for its caps, confirming the Steel Loop Cap relies on a silicone gasket
- review https://www.bottlepro.net/hydration-blog/which-water-bottles-completely-avoid-plastic editorial roundup notes Klean Kanteen loop caps keep plastic out of the water path; the only non-steel part is the silicone seal
Spot a mistake or something out of date? Let us know — corrections are how this stays accurate.