Boulder (Reflecta Lid)
A rare insulated bottle with a steel-lined spout lid - the Reflecta lid keeps the drink off plastic, with only silicone seals in the water path.
Plastic-free verdict: Silicone only
The Boulder is double-wall vacuum-insulated 18/8 stainless steel, and its Reflecta screw-top lid is stainless-steel-lined so that "drinks never touch plastic" - unusual for an insulated spout/chug-style lid, most of which have a plastic drink-contact surface. The lid's outer housing includes plastic, but it is not in the water path; the water-contact non-steel parts are the silicone sealing gasket(s) and the silicone bottle bumper (exterior). That puts it at silicone-only rather than fully plastic-free. Steel grade is stated as 18/8 but EcoVessel does not specify 304 vs 316.
Verification: Manufacturer confirmed · reviewed 2026-07-05
What it's made of
| Part | Material | Food contact |
|---|---|---|
| bottle body (double-wall) brand states "18/8 food-grade stainless steel"; 304 vs 316 not specified by manufacturer | Stainless Steel (304 / 18-8) | Yes |
| Reflecta lid interior / drink surface stainless-steel-lined; brand states drinks never touch plastic | Stainless Steel (304 / 18-8) | Yes |
| lid outer housing outer/insulating shell of the dual-opening lid; not in the water path | Plastic (other / unspecified) | No |
| lid sealing gasket food-grade silicone seal | Silicone | Yes |
| bottle bumper removable silicone base bumper (exterior only) | Silicone | No |
EcoVessel's flagship insulated bottle, using their TriMax triple-insulation and the Reflecta dual-opening lid. The Reflecta lid is the reason it belongs here: its drink-contact surface is stainless steel, so unlike Hydro Flask, S'well, and most insulated bottles, hot or cold water is not sitting against polypropylene at the mouth. It has a spout for drinking plus a wider opening, and a removable strainer for tea/fruit/ice on some configs.
Pros
- Steel-lined lid - drink-contact surface is steel, not plastic (rare for an insulated spout lid)
- Strong insulation (double-wall TriMax); large size range
- Removable silicone bumper protects the base
Cons
- Not plastic-free - the lid's outer housing is plastic (though out of the water path)
- Silicone gasket in the water path (silicone-only, not plastic-free)
- Manufacturer does not specify 304 vs 316 steel grade
Notes
- Sizes: Boulder commonly 20oz / 24oz / 32oz; kids TriMax bottles use different straw lids
- Reflecta lid also appears on EcoVessel's Aspen bottle
- Body grade: stated 18/8 only; treat 304-vs-316 as unverified
Categories: Water Bottles
Sources
Every material claim above is backed by these. This is the scattered info we centralized.
- manufacturer https://www.ecovessel.com/products/the-boulder-20-oz-1 Reflecta insulated screw-top lid - "drinks never touch plastic"; body is 18/8 food-grade stainless with silicone bumper
- manufacturer https://www.ecovessel.com/pages/our-tech TriMax insulation and Reflecta stainless-lined lid described
- review https://www.bottlepro.net/hydration-blog/which-water-bottles-completely-avoid-plastic independent roundup calls EcoVessel the only spout/chug-style lid it found with stainless steel underneath (water contacts silicone, not plastic)