---
product_id: 75881798
title: "Milton Optima 420 Thermosteel Hot and Cold Flask, 410 ml, Silver | ISI Certified | Vacuum Insulated | Rust Proof | Leak Proof | Tea | Coffee | Juice"
brand: "milton"
price: "R268"
currency: ZAR
in_stock: true
url: https://www.desertcart.co.za/products/75881798-milton-optima-420-thermosteel-hot-and-cold-flask-410-ml
store_origin: ZA
region: South Africa
---

# Keeps drinks hot for 12+ hrs Keeps drinks cold for 24 hrs Rust-proof 18/8 stainless steel Milton Optima 420 Thermosteel Hot and Cold Flask, 410 ml, Silver | ISI Certified | Vacuum Insulated | Rust Proof | Leak Proof | Tea | Coffee | Juice

**Brand:** milton
**Price:** R268
**Availability:** ✅ In Stock

## Summary

> 🔥 Sip in Style, Stay Hot or Cool All Day! ❄️

## Quick Answers

- **What is this?** Milton Optima 420 Thermosteel Hot and Cold Flask, 410 ml, Silver | ISI Certified | Vacuum Insulated | Rust Proof | Leak Proof | Tea | Coffee | Juice by milton
- **How much does it cost?** R268 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.co.za](https://www.desertcart.co.za/products/75881798-milton-optima-420-thermosteel-hot-and-cold-flask-410-ml)

## Best For

- milton enthusiasts

## Why This Product

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

## Key Features

- • **Built to Endure:** Premium 18/8 stainless steel construction ensures rust resistance and durability, designed to keep up with your busiest days and toughest commutes.
- • **Copper-coated Inner Layer:** Enhanced thermal retention technology means your beverage’s perfect temperature lasts longer—no compromises on taste or freshness.
- • **Leak-proof & Travel-ready:** Secure screw cap and ergonomic design fit effortlessly in your hand or backpack side pocket—no spills, no stress, just seamless hydration on the go.
- • **All-day Temperature Control:** Double-walled vacuum insulation locks in heat or chill, so your coffee stays piping hot or your juice refreshingly cold all day long.
- • **Certified Quality Assurance:** ISI certification guarantees top-tier safety, durability, and corrosion resistance, backed by a 1-year warranty for peace of mind.

## Overview

The Optima 420 Thermosteel Flask by Milton is a 410 ml vacuum-insulated, double-walled stainless steel flask with an inner copper coating for superior temperature retention. ISI certified and rust-proof, it keeps beverages hot for over 12 hours and cold for up to 24 hours. Designed for durability and leak-proof convenience, it’s the perfect companion for professionals on the move.

## Description

Milton Optima 420 Thermosteel Hot and Cold Flask, 410 ml, Silver | ISI Certified | Vacuum Insulated | Rust Proof | Leak Proof | Tea | Coffee | Juice

## Features

- Double walled insulated flask keeps your beverages hot or cold for long hours, Inner copper coating for better temperature retention
- It is made up of a durable 18/8 stainless steel, rust free, built to withstand the demands of everyday use
- ISI Certified: Our coffee mug is ISI certified, guaranteeing it meets the highest standards of quality, durability, corrosion resistance and 1 year warranty.
- The lid enables the mug to reduce the transfer of temperature keeps even more insulation
- This flask makes it perfect for carrying with you on any day-trip or anywhere you go. It is designed to be carried by hand or into the side compartments of your backpack for easy access.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Brand | MILTON |
| Capacity | 410 Milliliters |
| Colour | Silver |
| Recommended Uses For Product | Soup |
| Special Feature | Double Wall, Leakproof, durable |
| Age Range (Description) | Adult |
| Product Dimensions | 7.7W x 21H Centimeters |
| Model Name | OPTIMA |
| Item Weight | 277 Grams |
| Material | Stainless Steel |
| Number of Items | 1 |
| Pattern | Flask |
| Included Components | 1 - Piece Optima Thermosteel Flask (410 ml) |
| Product Care Instructions | Hand Wash Only |
| Base Diameter | 2 Inches |
| Cap Type | Screw Cap |
| With Lid | Yes |
| Is Dishwasher Safe | No |
| Manufacturer | HAMILTON, MILTON |
| Manufacturer | MILTON |
| Country of Origin | USA |
| Imported By | Hamilton Housewares Private Limited; 18002092151 SRV NO. 98/1/1, 98/1/2, 99/2/1, 100/1/1, Village Silli, UT of Dadar & Nagar Haveli, Silvassa-396230 |
| Item model number | MLN_EC-TMS-FIS-0008_STL |
| ASIN | B01FR6LPCS |

## Product Details

- **Brand:** MILTON
- **Capacity:** 410 Milliliters
- **Colour:** Silver
- **Recommended Uses For Product:** Soup
- **Special Feature:** Double Wall, Leakproof, durable

## Images

![Milton Optima 420 Thermosteel Hot and Cold Flask, 410 ml, Silver | ISI Certified | Vacuum Insulated | Rust Proof | Leak Proof | Tea | Coffee | Juice - Image 1](https://m.media-amazon.com/images/I/61Hvi3uE6xL.jpg)

## Questions & Answers

**Q: What is grade of steel used inside ? Is it stainless steel if yes then what grade ?**
A: Its 18/8 steel grade. Rust free

**Q: Why milk is turning pink in it?**
A: You my over cooked milk, observe one more time

**Q: What is the height of this bottle?**
A: 20 cm

**Q: Can i sterilised the cover along with the bottle**
A: U can't sterilise the bottle also
Just clean in mild detergent with brush

## Frequently Bought Together

- Milton Optima 420 Thermosteel Hot and Cold Flask, 420 ml, Silver | ISI Certified | Vacuum Insulated | Rust Proof | Leak Proof | Tea | Coffee | Juice
- Milton Duo DLX 1000 Thermosteel Water Bottle 1 LTR, 24 Hr Hot and Cold I Leak Proof Lid, ISI Certified I Vacuum Insulated I for Office, Gym, School I Silver

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**Shop now:** [https://www.desertcart.co.za/products/75881798-milton-optima-420-thermosteel-hot-and-cold-flask-410-ml](https://www.desertcart.co.za/products/75881798-milton-optima-420-thermosteel-hot-and-cold-flask-410-ml)

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*Product available on Desertcart South Africa*
*Store origin: ZA*
*Last updated: 2026-02-07*