---
product_id: 76701708
title: "Optima 350 Thermosteel Hot and Cold Flask, 340 ml, Silver | ISI Certified | Vacuum Insulated | Rust Proof | Leak Proof | Tea | Coffee | Juice"
brand: "milton"
price: "A$24"
currency: AUD
in_stock: true
category: "Milton"
url: https://www.desertcart.com.au/products/76701708-optima-350-thermosteel-hot-and-cold-flask-340-ml-silver
store_origin: AU
region: Australia
---

# Keeps drinks hot for 12+ hrs Maintains cold beverages up to 24 hrs Rust-proof 18/8 stainless steel build Optima 350 Thermosteel Hot and Cold Flask, 340 ml, Silver | ISI Certified | Vacuum Insulated | Rust Proof | Leak Proof | Tea | Coffee | Juice

**Brand:** milton
**Price:** A$24
**Availability:** ✅ In Stock

## Summary

> 🥤 Elevate your sip game — stay hot, stay cool, stay ahead!

## Quick Answers

- **What is this?** Optima 350 Thermosteel Hot and Cold Flask, 340 ml, Silver | ISI Certified | Vacuum Insulated | Rust Proof | Leak Proof | Tea | Coffee | Juice by milton
- **How much does it cost?** A$24 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.com.au](https://www.desertcart.com.au/products/76701708-optima-350-thermosteel-hot-and-cold-flask-340-ml-silver)

## 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

- • **Smart Storage Lid:** Innovative lid compartment for sugar cubes, meds, or snacks—stay prepared and stylish on the go.
- • **Durability Meets Style:** Crafted from rust-resistant 18/8 stainless steel, this sleek silver flask withstands daily hustle without compromising on elegance.
- • **All-day Temperature Lock:** Double-walled vacuum insulation locks in heat or chill, so your coffee or juice stays perfect from morning meetings to evening unwind.
- • **Copper-Coated Inner Layer:** Enhanced thermal retention with inner copper coating—because your beverage deserves premium care.
- • **Certified Quality Assurance:** ISI certified with a 1-year warranty, ensuring you invest in reliability that matches your professional lifestyle.

## Overview

The Milton Optima 350 Thermosteel Flask is a 340 ml vacuum-insulated, double-walled stainless steel flask designed to keep beverages hot for over 12 hours and cold for up to 24 hours. Featuring an inner copper coating for superior temperature retention, rust-proof 18/8 stainless steel construction, and a leak-proof lid with a special compartment for essentials, it’s ISI certified and backed by a 1-year warranty—perfect for professionals who demand durability and style on the move.

## Description

Milton Optima 350 Thermosteel Hot and Cold Flask, 340 ml, Silver | ISI Certified | Vacuum Insulated | Rust Proof | Leak Proof | Tea | Coffee | Juice : desertcart.in

## 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. Special compartment for keeping sugar cubes, medicines and more. Ideal for carrying liquids such as sambar, curries, soup and dal
- 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 |
|---------------|-------|
| ASIN | B00IA0WW0I |
| Age Range (Description) | Adult |
| Best Sellers Rank | #499 in Home & Kitchen ( See Top 100 in Home & Kitchen ) #14 in Insulated Bottles |
| Brand | MILTON |
| Cap Type | Screw Cap |
| Capacity | 340 Milliliters |
| Colour | Silver |
| Country of Origin | China |
| Generic Name | thermos |
| 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 |
| Importer | 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 |
| Included Components | 1 - Piece Optima Thermosteel Flask (350 ml) |
| Is Dishwasher Safe | No |
| Item Weight | 300 g |
| Item model number | M1090-MTO-03 |
| Manufacturer | Hamilton Housewares P. Ltd., SRV NO. 98/1/1, 98/1/2, 99/2/1, 100/1/1, Village Silli, UT of Dadar & Nagar Haveli, Silvassa-396230 |
| Material | Stainless Steel |
| Model Name | OPTIMA MUG 350 ML |
| Net Quantity | 1 Count |
| Number of Items | 1 |
| Packer | 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 |
| Pattern | flask |
| Product Care Instructions | Hand Wash Only |
| Product Dimensions | 7.4W x 17.8H Centimeters |
| Recommended Uses For Product | Coffee |
| Special Feature | Vacuum Insulated, Double Wall, Leakproof, Durable, Rust Resistant |
| With Lid | Yes |

## Product Details

- **Brand:** MILTON
- **Capacity:** 340 Milliliters
- **Colour:** Silver
- **Recommended Uses For Product:** Coffee
- **Special Feature:** Vacuum Insulated, Double Wall, Leakproof, Durable, Rust Resistant

## Images

![Optima 350 Thermosteel Hot and Cold Flask, 340 ml, Silver | ISI Certified | Vacuum Insulated | Rust Proof | Leak Proof | Tea | Coffee | Juice - Image 1](https://m.media-amazon.com/images/I/613kd4LyzGL.jpg)

## Available Options

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

## 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: How much gasket are their in Milton optima 350 thermosteel . 1or 2??**
A: 1

**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

## Frequently Bought Together

- Milton Thermosteel Optima 350 Double Wall Vacuum Insulated Flask, 350 ml | 12 oz | Hot and Cold for Long Hours, 18/8 Stainless Steel, Coffee Travel Mug Tumbler, Rust and Leak-Proof, BPA-Free Silver
- Milton Elfin Thermosteel Thermos Flask, 500 ml
- Milton Optima 350 Thermosteel Hot and Cold Flask, 350 ml, Silver | Vacuum Insulated | Rust Proof | Leak Proof | Tea | Coffee | Juice

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*Product available on Desertcart Australia*
*Store origin: AU*
*Last updated: 2026-02-08*