---
product_id: 53517280
title: "Thermos Ultimate Series Flask, 900ml"
brand: "thermos"
price: "AR$265919"
currency: ARS
in_stock: true
reviews_count: 13
url: https://www.desertcart.com.ar/products/53517280-thermos-ultimate-series-flask-900ml
store_origin: AR
region: Argentina
---

# 24h hot retention 24h cold retention Durable stainless steel + silicone Thermos Ultimate Series Flask, 900ml

**Brand:** thermos
**Price:** AR$265919
**Availability:** ✅ In Stock

## Summary

> 🔥 Stay hot, stay cool, stay ahead. Your ultimate hydration sidekick! ❄️

## Quick Answers

- **What is this?** Thermos Ultimate Series Flask, 900ml by thermos
- **How much does it cost?** AR$265919 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.com.ar](https://www.desertcart.com.ar/products/53517280-thermos-ultimate-series-flask-900ml)

## Best For

- thermos enthusiasts

## Why This Product

- Trusted thermos brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Safe and sustainable:** BPA-free materials backed by a 5-year guarantee for peace of mind and longevity.
- • **Sweat-proof, cool-to-touch:** No more slippery bottles or burnt fingers—comfort meets convenience.
- • **All-day temperature mastery:** Keeps drinks hot or cold for a full 24 hours, so your beverage is always just right.
- • **Smooth sipping, zero spills:** Innovative two-part stopper delivers a controlled flow for mess-free hydration.
- • **Built to endure your adventures:** Stainless steel body with protective silicone rings ensures ultimate durability and style.

## Overview

The Thermos Charcoal Ultimate Drinks Flask (900ml) features advanced vacuum insulation technology that keeps beverages hot or cold for 24 hours. Crafted from durable stainless steel with protective silicone rings, it offers a sweat-proof, cool-to-touch experience. Its two-part stopper ensures smooth pouring without leaks. BPA-free and backed by a 5-year guarantee, this flask is designed for professionals on the go who demand reliable, stylish hydration.

## Description

Product Description Ultimate MKII 900 ml flask with ultimate insulation for maximum temperature retention, hot or cold, keeping hot or cold for 24 hours. Cool to the touch with hot liquids, sweat-proof with cold and with protective silicone rings for ultimate durability. Two part stopper to smooth the flow of liquid. Set Contains: 1 x Thermos Ultimate flask

## Features

- Thermos vacuum insulation technology for maximum temperature retention, keeps hot for 24 hours and cold for 24 hours
- Stainless steel interior and exterior featuring protective silicone rings for high durability
- Cool to the touch with hot liquids, sweat-proof with cold
- Two part stopper to smooth the flow of liquids
- BPA Free.5 year guarantee

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Additional Features | Durability,Lightweight |
| Age Range Description | Adult |
| Asin | B013YMS8RM |
| Base Diameter | 8.2 centimeters |
| Best Sellers Rank | #281,757 in Kitchen & Dining (See Top 100 in Kitchen & Dining) #2,291 in Insulated Bottles |
| Brand Name | THERMOS |
| Cap Type | Screw Cap |
| Capacity | 900 ml |
| Color | Gray |
| Customer Reviews | 4.7 4.7 out of 5 stars (2,221) 4.7 out of 5 stars |
| Eu Spare Part Availability Duration | 5 years |
| Global Trade Identification Number | 05010576041104 |
| Included Components | Lid |
| Item Dimensions W X H | 3.15"W x 11.81"H |
| Item Type Name | Ultimate MKII Series Flask 900ml |
| Manufacturer | Thermos |
| Material Type | Silicone Stainless Steel |
| Model Name | FFX900 |
| Number Of Items | 1 |
| Pattern | Solid |
| Product Care Instructions | Hand Wash Only |
| Recommended Uses For Product | Water |
| Theme | Solid |
| Unit Count | 1 Count |

## Product Details

- **Brand:** THERMOS
- **Capacity:** 900 Milliliters
- **Color:** Gray
- **Recommended Uses For Product:** Water
- **Special Feature:** Durability,Lightweight

## Images

![Thermos Ultimate Series Flask, 900ml - Image 1](https://m.media-amazon.com/images/I/618DdFWdwpL.jpg)
![Thermos Ultimate Series Flask, 900ml - Image 2](https://m.media-amazon.com/images/I/41Q-HdaGaHL.jpg)

## Available Options

This product comes in different **Color, Style** options.

## Questions & Answers

**Q: What country is it made in?**
A: Made in malaysia

## Customer Reviews

### ⭐⭐⭐⭐⭐ Keeps things hot
*by  on Reviewed in the United States December 10, 2024*

This is an excellent Thermos. I’m just back from Antarctica with temps in the -20’s and -30’s. This flask kept my coffee warm, and it was great to have a drink of hot coffee on my breaks up Vinson. One thing I would change is I would go for the smaller size.

### ⭐⭐⭐⭐⭐ Keeps it HOT!
*by  on Reviewed in the United States February 23, 2023*

I haven't had the opportunity to keep anything cold in this Thermos yet, but I can say it definitely keeps my tea hot 24 hrs. I pre-heat it for about 10-20 mins before filling with hot tea, and it keeps it steaming hot 24 hours. It could possibly keep it hot longer, but I usually drink the last cup right at 24 hours after filling.

### ⭐⭐⭐⭐⭐ Overseas shipping slow.
*by  on Reviewed in the United States November 12, 2025*

Great product. As described.

## Frequently Bought Together

- Thermos - Charcoal Ultimate Flask (900ml), Reusable Insulated Stainless Steel Thermal Coffee Cup for Hot or Cold Drinks, Vacuum Sealed Water Flask with a Leak-Proof Lid, 24hr Hot/24hr Cold
- Thermos - Charcoal Ultimate Flask (500ml), Reusable Insulated Stainless Steel Thermal Coffee Cup for Hot or Cold Drinks, Vacuum Sealed Water Flask with a Leak-Proof Lid, 24hr Hot/24hr Cold

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**Shop now:** [https://www.desertcart.com.ar/products/53517280-thermos-ultimate-series-flask-900ml](https://www.desertcart.com.ar/products/53517280-thermos-ultimate-series-flask-900ml)

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*Product available on Desertcart Argentina*
*Store origin: AR*
*Last updated: 2026-08-17*