---
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: "R$203"
currency: BRL
in_stock: true
reviews_count: 13
category: "Milton"
url: https://www.desertcart.com.br/products/76701708-optima-350-thermosteel-hot-and-cold-flask-340-ml-silver
store_origin: BR
region: Brazil
---

# Leak-proof screw cap seal Maintains hot beverages for 7+ hrs Keeps drinks cold up to 8 hrs Optima 350 Thermosteel Hot and Cold Flask, 340 ml, Silver | ISI Certified | Vacuum Insulated | Rust Proof | Leak Proof | Tea | Coffee | Juice

**Brand:** milton
**Price:** R$203
**Availability:** ✅ In Stock

## Summary

> 🔥 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?** R$203 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.com.br](https://www.desertcart.com.br/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

- • **Built to Endure:** Crafted from premium 18/8 stainless steel with rust-proof and durable design, made for your daily hustle without compromise.
- • **Smart Storage Innovation:** Unique lid compartment to stash sugar cubes, meds, or small essentials—because your flask should work as hard as you do.
- • **Travel-Ready Convenience:** Compact 340 ml size fits perfectly in backpacks or hand-carry, making it your go-to companion for every meeting, commute, or adventure.
- • **Ultimate Temperature Lock:** Double-walled vacuum insulation locks in heat or chill for hours, so your coffee or juice stays just right all day.
- • **Certified Quality Assurance:** ISI certified for unmatched durability and corrosion resistance, backed by a 1-year warranty for peace of mind.

## Overview

The Milton Optima 350 Thermosteel Flask is a sleek, 340 ml vacuum-insulated bottle designed to keep beverages hot for over 7 hours or cold for up to 8 hours. Made from rust-proof 18/8 stainless steel and ISI certified, it features a leak-proof screw cap and a smart lid compartment for added convenience. Perfectly sized for professionals on the move, it combines durability with innovative design to elevate your daily hydration game.

## 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: Home & Kitchen

Review: Best product, cost is little much high. - Im using this for few months, keeping water, milk hot for 7 to 8 hrs unexpectedly. Worth buying. Very good product. Satisfied a lot.
Review: Just made for traveling. Good retention+ No leaks simple system - Quite good Heat retention. The outside never get's hot , or leaks heat , better than most in this price range . Good quality, material .so less worry about failure. Good seal , doesn't leak . I have used it before 1 year. Upto expections. Keeps vapours tight . It doesn't have that drinking straw etc but that's good cuz it gives full seal and air tight. So it open with pressure which is good . Very less complains from me. So Heat retention 9/10, sealing 9.5/10 .. that's all u need .

## 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 | #1,184 in Home & Kitchen ( See Top 100 in Home & Kitchen ) #32 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

## Customer Reviews

### ⭐⭐⭐⭐⭐ Best product, cost is little much high.
*by U***R on 3 January 2026*

Im using this for few months, keeping water, milk hot for 7 to 8 hrs unexpectedly. Worth buying. Very good product. Satisfied a lot.

### ⭐⭐⭐⭐⭐ Just made for traveling. Good retention+ No leaks simple system
*by P***R on 18 October 2025*

Quite good Heat retention. The outside never get's hot , or leaks heat , better than most in this price range . Good quality, material .so less worry about failure. Good seal , doesn't leak . I have used it before 1 year. Upto expections. Keeps vapours tight . It doesn't have that drinking straw etc but that's good cuz it gives full seal and air tight. So it open with pressure which is good . Very less complains from me. So Heat retention 9/10, sealing 9.5/10 .. that's all u need .

### ⭐⭐⭐⭐ Good
*by P***M on 10 December 2025*

Really nice product. Good to use packing gravy for lunch box..

## 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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**Shop now:** [https://www.desertcart.com.br/products/76701708-optima-350-thermosteel-hot-and-cold-flask-340-ml-silver](https://www.desertcart.com.br/products/76701708-optima-350-thermosteel-hot-and-cold-flask-340-ml-silver)

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*Product available on Desertcart Brazil*
*Store origin: BR*
*Last updated: 2026-02-15*