---
product_id: 53517280
title: "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"
brand: "thermos"
price: "฿8403"
currency: THB
in_stock: true
reviews_count: 8
category: "Thermos"
url: https://www.desertcart.co.th/products/53517280-charcoal-ultimate-flask-900ml-reusable-insulated-stainless-steel-thermal-coffee
store_origin: TH
region: Thailand
---

# 24hr hot retention 24hr cold retention Durable stainless steel + silicone 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

**Brand:** thermos
**Price:** ฿8403
**Availability:** ✅ In Stock

## Summary

> 🔥 Stay hot, stay cool, stay unstoppable! ❄️

## Quick Answers

- **What is this?** 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 by thermos
- **How much does it cost?** ฿8403 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.co.th](https://www.desertcart.co.th/products/53517280-charcoal-ultimate-flask-900ml-reusable-insulated-stainless-steel-thermal-coffee)

## 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 & Sustainable:** BPA-free materials with a 5-year guarantee—invest in your hydration and the planet.
- • **Cool Comfort, No Sweat:** Stay confident with a sweat-proof exterior that stays cool to the touch even with boiling liquids inside.
- • **Effortless Sip Control:** Innovative two-part stopper ensures a smooth, spill-free pour every time—because leaks are so last season.
- • **All-Day Temperature Mastery:** Keeps your coffee piping hot or ice-cold for a full 24 hours—no compromises.
- • **Built to Brave Any Adventure:** Rugged stainless steel body with protective silicone rings means this flask can handle your busiest days and wildest trips.

## Overview

The Thermos Charcoal Ultimate 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 exterior. Its innovative two-part stopper ensures smooth pouring without leaks. BPA-free and backed by a 5-year guarantee, this lightweight, reusable flask is designed for professionals who demand performance and style on the go.

## 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

Review: Keeps things hot - 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.
Review: Overseas shipping slow. - Great product. As described.

## 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 |
|---------------|-------|
| ASIN | B013YMS8RM |
| Additional Features | Durability,Lightweight |
| Age Range (Description) | Adult |
| Age Range Description | Adult |
| Base Diameter | 8.2 Centimeters |
| Best Sellers Rank | #232,955 in Kitchen & Dining ( See Top 100 in Kitchen & Dining ) #1,646 in Insulated Bottles |
| Brand | THERMOS |
| Brand Name | THERMOS |
| Cap Type | Screw Cap |
| Capacity | 900 Milliliters |
| Color | Gray |
| Customer Reviews | 4.6 out of 5 stars 2,207 Reviews |
| EU Spare Part Availability Duration | 5 Years |
| Global Trade Identification Number | 05010576041104 |
| Included Components | Lid |
| Is Oven Safe | No |
| Is the item dishwasher safe? | No |
| Is the item microwaveable? | No |
| Item Dimensions W x H | 3.15"W x 11.81"H |
| Item Height | 3.46 centimeters |
| Item Type Name | Ultimate MKII Series Flask 900ml |
| Item Weight | 390 Grams |
| 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 |
| Special Feature | Durability,Lightweight |
| Theme | Solid |
| Unit Count | 1.0 Count |
| With Lid | Yes |

## Product Details

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

## Images

![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 - Image 1](https://m.media-amazon.com/images/I/618DdFWdwpL.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 M***L on 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.

### ⭐⭐⭐⭐⭐ Overseas shipping slow.
*by G***2 on November 12, 2025*

Great product. As described.

### ⭐⭐⭐⭐⭐ Keeps it HOT!
*by P***S on 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.

## 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.co.th/products/53517280-charcoal-ultimate-flask-900ml-reusable-insulated-stainless-steel-thermal-coffee](https://www.desertcart.co.th/products/53517280-charcoal-ultimate-flask-900ml-reusable-insulated-stainless-steel-thermal-coffee)

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*Product available on Desertcart Thailand*
*Store origin: TH*
*Last updated: 2026-02-02*