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The exterior of the Klean Kanteen Stainless Loop Cap is polypropylene (pp#5) which is recognized as being BPA-free and completely safe for use in food containers.
The Loop Cap interior is food-quality stainless steel and only the stainless steel comes in contact with your food or drink. Klean Kanteen is the only stainless steel bottle manufacturer who can make that claim because it requires a precision crafted external thread design that's meticulous and expensive to manufacture.
Loop Caps make your bottle totally leak proof so it's safe to throw in your bag, pack or briefcase.
The silicon seal won't become moldy or retain odors over time like rubber seals used in competing insulated bottles.
All wide Klean Kanteen Insulated Bottles include a Loop Cap.
Note: The Klean Kanteen Loop Cap should be hand washed only.
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