Thermos® FBB-3502MR Midnight Red 350ml Stainless Steel Vacuum Insulated Flask – Screw Stopper

Brand: Thermos®
Model: FBB-3502MR
Product Type: Vacuum Insulated Flask
Capacity: 350ml
Color: Midnight Red
Body Material: High-Grade Stainless Steel
Interior: Stainless Steel
Exterior: Stainless Steel
Insulation: Vacuum Insulation with Copper-Coated Layer
Stopper: Screw Stopper
Stopper Material: BPA-Free Food-Safe Polypropylene
Seal: Silicone Ring
Suitable For: Hot & Cold Beverages

The Thermos® FBB-3502MR Midnight Red 350ml Stainless Steel Vacuum Insulated Flask

 is a compact and durable flask designed to help maintain the temperature of hot and cold beverages. It features high-grade stainless steel construction, a copper-coated insulation layer, and a BPA-free food-safe polypropylene screw stopper with a silicone seal ring, making it practical for work, commuting, school, and travel.

Introduction

The Thermos® FBB-3502MR 350ml Flask combines compact portability with reliable vacuum insulation for everyday beverage use. Its 350ml capacity makes it convenient for carrying a personal serving of coffee, tea, water, or another beverage without the bulk of a larger thermos.

The interior and exterior are made from durable stainless steel, while the copper-coated insulation layer helps minimize heat loss and improve temperature retention. The screw stopper is made from BPA-free, food-safe polypropylene and features a silicone seal ring to provide a secure closure during transportation.

Key Materials Overview

High-Grade Stainless Steel

The interior and exterior are constructed from durable stainless steel, providing a strong and reusable body suitable for everyday beverage use.

Copper-Coated Insulation Layer

The copper-coated layer works within the insulation system to help reduce heat transfer and minimize heat loss.

BPA-Free Polypropylene Stopper

The screw stopper is made from BPA-free, food-safe polypropylene and provides a secure closure for transportation.

Silicone Seal Ring

The silicone ring helps create a tight seal between the stopper and flask, reducing the risk of leakage when properly closed.

Comparison Section

Thermos® FBB-3502MR vs Thermos® Light & Compact 350ml Flask

Both offer a compact 350ml format and vacuum insulation. The FBB-3502MR uses a screw stopper, while the Light & Compact model features a push-button valve, providing a different serving experience.

Thermos® FBB-3502MR vs 710ml Thermos® Tumbler

The 350ml flask is more compact and portable for individual servings, while the 710ml tumbler provides greater capacity and is better suited for longer periods between refills.

Thermos® FBB-3502MR vs Regular Bottle

The FBB-3502MR provides vacuum insulation and temperature retention, while a standard non-insulated bottle generally does not offer comparable thermal performance.

Health Boutique Expert Insight

Compact vacuum flasks are ideal when portability matters as much as temperature retention. The stainless steel construction and copper-assisted insulation system help reduce heat transfer, while the screw stopper provides a simple and secure closure. Regularly cleaning the stopper and silicone seal is important for maintaining hygiene.

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💙 A compact and durable insulated flask designed to keep your favorite beverages at the desired temperature while you're on the go.

Compact 350ml capacity.
High-grade stainless steel interior and exterior.
Vacuum-insulated construction.
Copper-coated insulation layer helps minimize heat loss.
BPA-free food-safe polypropylene screw stopper.
Silicone seal ring helps provide secure closure.
Lightweight and convenient for everyday carrying.
Suitable for hot and cold beverages.
Ideal for work, school, commuting, and travel.
Midnight Red finish with a classic compact design.

Why Customers Choose This Product

The Thermos® FBB-3502MR combines compact size, durable stainless steel construction, vacuum insulation, and a secure screw stopper, making it a practical choice for carrying individual servings of beverages.

Who Is It Suitable For?

Office workers.
Students.
Commuters.
Travelers.
Coffee and tea drinkers.
People who prefer compact drinkware.
Anyone looking for a personal insulated flask.

Who May Prefer Another Product?

Those who need a larger volume for extended hydration may prefer a 710ml or 1100ml insulated travel mug.

Wash the flask and stopper before first use.
Fill with your preferred hot or cold beverage.
Avoid overfilling.
Screw the stopper firmly into place.
Ensure the silicone seal is correctly positioned.
Carry the flask upright when possible.
Unscrew the stopper carefully when ready to drink or pour.
Clean the flask and stopper thoroughly after use.
Follow the manufacturer's care instructions.

High-Grade Stainless Steel, Copper-Coated Insulation Layer, BPA-Free Polypropylene Stopper, & Silicone Seal Ring

What is the capacity of the Thermos® FBB-3502MR?

The flask has a 350ml capacity.

Is it made from stainless steel?

Yes. Both the interior and exterior use durable stainless steel.

Does it use vacuum insulation?

Yes. The flask uses vacuum insulation with a copper-coated insulation layer.

What is the purpose of the copper-coated layer?

The copper-coated layer helps reduce heat transfer and minimize heat loss within the insulation system.

Does it have a screw stopper?

Yes. It uses a screw-style stopper for secure closure.

Is the stopper BPA-free?

Yes. The stopper is made from BPA-free, food-safe polypropylene.

Does the stopper have a silicone seal?

Yes. A silicone seal ring helps provide a secure closure and reduce leakage.

Can it hold hot beverages?

Yes. It is designed for hot and cold beverages.

Is it suitable for travel?

Yes. Its compact 350ml capacity makes it convenient for commuting, school, work, and travel.

Is it suitable for everyday use?

Yes. The durable stainless steel construction and compact design make it suitable for regular daily use.

What does the Thermos® FBB-3502MR use for insulation?

It uses a vacuum-insulated construction with a copper-coated insulation layer designed to help minimize heat loss.

Is 350ml enough for one serving?

Yes. A 350ml capacity is suitable for an individual serving of coffee, tea, water, or another beverage.

What is the advantage of a screw stopper?

A screw stopper provides a straightforward, secure closure and helps prevent accidental opening during transportation when properly tightened.

Is the stainless steel interior coated?

The supplied specifications identify the interior as stainless steel and do not specify an additional interior coating.

Can I carry it in a bag?

Its compact 350ml size makes it convenient for carrying, but it should be kept upright whenever possible and the stopper should be properly secured.

Is the Thermos® FBB-3502MR suitable for everyday use?

Yes. Its compact size, durable stainless steel body, vacuum insulation, and secure screw stopper make it practical for daily work, school, commuting, and travel.

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