---
product_id: 76701708
title: "Milton Optima 350 Thermosteel Hot and Cold Flask, 340 ml, Silver | ISI Certified | Vacuum Insulated | Rust Proof | Leak Proof | Tea | Coffee | Juice"
brand: "milton"
price: "4271 som"
currency: KGS
in_stock: true
reviews_count: 8
category: "Milton"
url: https://www.desertcart.kg/products/76701708-milton-optima-350-thermosteel-hot-and-cold-flask-340-ml
store_origin: KG
region: Kyrgyzstan
---

# 100% leakproof seal Retains heat for 7+ hrs Keeps drinks cold up to 8 hrs Milton Optima 350 Thermosteel Hot and Cold Flask, 340 ml, Silver | ISI Certified | Vacuum Insulated | Rust Proof | Leak Proof | Tea | Coffee | Juice

**Brand:** milton
**Price:** 4271 som
**Availability:** ✅ In Stock

## Summary

> 🔥 Stay Hot, Stay Cool, Stay Ahead! ❄️

## Quick Answers

- **What is this?** Milton 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?** 4271 som with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.kg](https://www.desertcart.kg/products/76701708-milton-optima-350-thermosteel-hot-and-cold-flask-340-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:** Crafted from premium 18/8 stainless steel, rust-proof and designed to survive your busiest days.
- • **Travel-Ready Design:** Slim, lightweight 340 ml flask fits effortlessly in your backpack side pocket for on-the-go hydration.
- • **Smart Storage Solution:** Innovative lid compartment for sugar cubes, meds, or small essentials—because details matter.
- • **All-day Temperature Lock:** Double-walled vacuum insulation keeps your coffee piping hot or your juice refreshingly cold for hours.
- • **Certified Quality Assurance:** ISI certification guarantees top-tier durability and corrosion resistance, backed by a 1-year warranty.

## Overview

The Milton Optima 350 Thermosteel Flask is a sleek, ISI-certified 340 ml insulated bottle featuring double-wall vacuum technology and inner copper coating for superior temperature retention. Made from durable, rust-proof 18/8 stainless steel, it offers leak-proof security and a smart lid compartment for added convenience—perfect for professionals who demand style, reliability, and performance 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: 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 |
| Age Range Description | Adult |
| Brand | MILTON |
| Cap Type | Screw Cap |
| Capacity | 340 Milliliters |
| Colour | Silver |
| Country of Origin | China |
| Customer Reviews | 4.3 out of 5 stars 7,372 Reviews |
| Enclosure Material | Stainless Steel |
| Importer Contact Information | 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 Oven Safe | No |
| Is the item dishwasher safe? | No |
| Is the item microwaveable? | No |
| Item Dimensions W x H | 7.4W x 17.8H Centimeters |
| Item Height | 9.84 Inches |
| Item Type Name | Thermos |
| Item Weight | 0.3 Kilograms |
| 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 |
| Manufacturer Contact Information | SRV NO. 98/1/1, 98/1/2, 99/2/1, 100/1/1, Village Silli, UT of Dadar & Nagar Haveli, Silvassa-396230 |
| Manufacturer Warranty Description | This product is under 1 year warranty from the date of retail purchase against any manufacturing defects in material and workmanship. The Warranty does not cover damages resulting from accidents, mishandling or tampering with the mechanism. Warranty valid against producing original bill endorsed by seller. |
| Model Name | OPTIMA MUG 350 ML |
| Number of Items | 1 |
| OutputCapacity | 340 Milliliters |
| Packer Contact Information | 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 Features | Vacuum Insulated, Double Wall, Leakproof, Durable, Rust Resistant |
| Recommended Uses For Product | Coffee |
| Special Feature | Vacuum Insulated, Double Wall, Leakproof, Durable, Rust Resistant |
| Theme | No Theme |
| Unit Count | 1 Count |
| With Lid | Yes |

## Product Details

- **Brand:** MILTON
- **Capacity:** 350 Milliliters
- **Colour:** Silver
- **Recommended Uses For Product:** Coffee
- **Special Feature:** Vacuum Insulated, Double Wall, Leakproof, Durable, Rust Resistant

## Images

![Milton 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.kg/products/76701708-milton-optima-350-thermosteel-hot-and-cold-flask-340-ml](https://www.desertcart.kg/products/76701708-milton-optima-350-thermosteel-hot-and-cold-flask-340-ml)

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*Product available on Desertcart Kyrgyzstan*
*Store origin: KG*
*Last updated: 2026-02-05*