Mizu M8 with Stainless Steel Cap
Silicone is only a gasket/seal — what touches your food is Stainless Steel (304 / 18-8).
Single-wall 18/8 steel bottle paired with Mizu's all-stainless screw cap, so the water path is steel plus a small silicone gasket.
The verdict: Silicone only
The M8 is a single-wall 18/8 stainless bottle. It ships with a plastic loop cap, but Mizu sells a dedicated all-stainless M-series Steel Cap, and with that cap the water path is 18/8 steel sealed by a small removable silicone gasket - nothing plastic touches the drink. We rate it in that steel-cap configuration; with the stock plastic loop cap it would be minimal-contact. An affordable, widely-sold alternative to the Klean Kanteen / Hydro Flask steel-cap route.
Verification: Manufacturer confirmed · Last reviewed
The M8 ships with a plastic loop cap; this all-stainless M-series cap is what makes the water path plastic-bar-the-gasket. Buy it separately.
What it's made of
| Part | Material | Food contact |
|---|---|---|
| bottle body (single-wall) 18/8 (304) food-grade stainless; some finishes add an exterior powder coat that does not contact the drink | Stainless Steel 304 / 18-8 | Yes primary |
| Loop cap (stock - replaced by the Steel Cap) ships with — replace Plastic loop cap the M8 ships with. | Polypropylene PP, #5 | primary |
| Steel Cap (add-on - replaces the stock plastic loop cap) Mizu's all-18/8-stainless M-series cap; a separate SKU. | Stainless Steel 304 / 18-8 | Yes primary |
| cap gasket small removable silicone sealing gasket - the only non-metal part in the water path | Silicone | Yes seal |
Mizu's M8 is a lightweight single-wall narrow-mouth 25oz stainless bottle - no insulation, so it's lighter and cheaper than a double-wall bottle. The all-steel M-series cap it takes fits every M-series body (M5, M8), so one cap covers the range. It's the affordable end of the "steel body + steel cap" route that Klean Kanteen and Hydro Flask also sell.
Pros
- Among the cheapest ways into an all-steel drink path
- One cap fits the whole M-series line (M5, M8)
- Light single-wall body; the silicone gasket is small and removable
Cons
- Doesn't ship this way - the all-stainless cap is a separate purchase
- Single-wall, so no insulation
- Some finishes use an exterior powder coat (doesn't touch the drink, but worth noting)
- The all-steel cap has been intermittently backordered
Notes
- Popping the silicone gasket out gives a fully steel path, but you lose the leakproof seal
Categories: Water Bottles
Sources
Every material claim above is backed by these. This is the scattered info we centralized.
- manufacturer https://www.mizulife.com/products/m-series-stainless-steel-cap Mizu M-series Stainless Steel Cap is 18/8 food-grade stainless and fits all M-series bottles
- manufacturer https://www.mizulife.com/products/m8 M8 is a 25oz single-wall 18/8 stainless bottle; ships with a loop cap
- review https://www.amazon.com/Mizu-Signature-Multiple-Colors-Bottles/dp/B07X5G1WTH Signature Loop Cap listing (the stock cap) - fits M5/M8/V8, distinct from the all-stainless replacement cap
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