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Keep Warm - Keep Cold - No More Worries

CESTO Vacuum Flask

We craft healthy and simple lifestyles for travellers, pack-and-go brown baggers to transform their on-the-go lifestyle experiences with convenient travel and meal-preparation solutions with our selected premium vacuum flasks.

Signature Pick

on-the-go lifestyle

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Which Flask Grade Meets My Needs?

SUS304 . SUS316 . SUS316L

Which Flask Grade Meets My Needs?

SUS304 . SUS316 . SUS316L

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Premium Stainless Steel That Goes Beyond Food Grade

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Are You Using
Your Vacuum Container Smartly?

Smart Storage N Usage

Are You Using Your Vacuum Container Smartly?

Smart Storage N Usage
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Which Vacuum Flask Grade Meets Your Needs?

SUS304, SUS316 or SUS316L?

Stainless Steel

SUS304

SUS316

SUS316L

Composition

Chromium (18%)
Nickel (8%)

Chromium (16%)
Nickel (10%)
Molybdenum (2-3%)

Similar to SUS316 but with lower carbon content.

Quality Level

Food-grade stainless steel.

Premium stainless steel with enhanced resistance to salt, acids, and harsh conditions.

High-grade stainless steel designed for extreme environments.

Best for Foods & Beverages

Good for everyday use with non-acidic beverages.

Ideal for salty, acidic, or slightly corrosive beverages like fruit juices, electrolyte drinks, or soups.

Excellent for highly acidic or sensitive beverages like kombucha, wine, or citrus juices.

Food Industry

Used in kitchen utensils, basic food storage containers, water bottles, and cutlery.

Containers for processing acidic foods, juices, or sauces.

Found in premium food-grade containers, wine barrels, and long-term storage for acidic or salty foods.

Weight

Lightweight compared to SUS316 and SUS316L.

Slightly heavier than SUS304 due to added molybdenum.

Similar to SUS316.

Cost

More affordable; widely used for budget-friendly flasks.

Slightly more expensive than SUS304 due to enhanced properties.

Slightly costly than SUS316, often found in luxury or specialized products, but built for longevity.

Rust Resistance

Offers decent rust resistance but not in saline or acidic conditions.

Higher corrosion resistance, especially in salty or acidic environments.

Superior rust resistance, even in extreme environments.

Summary

SUS304

Essential Food Grade

Best for general-purpose vacuum flasks used daily for common drinks. Affordable and reliable.

SUS316

Premium Food Grade

Also known as medical grade. Great for travelers or outdoor use where beverages or foods might have salt or acids, such as juices or soups.

SUS316L

X Premium Food Grade

Known as medical grade with superior corrosion resistance. The ultimate choice for luxury and sensitive on-the-go beverages for acidic drinks like citrus juices, kombucha or salty foods.

Disclaimer :
The information provided above is intended as a general guideline to help users understand the stainless steel grades commonly used in vacuum flasks. While we strive to ensure the accuracy of this information and the quality of our products, proper care and use are essential to maintain their performance. We cannot be held responsible for misuse or unintended outcomes. Should you have questions, we are always happy to assist.

Are You Using
Your Vacuum Container Smartly?

Guide to Smart Storage and Usage

While vacuum containers are designed for extended freshness and storage hours, it’s essential to consider the natural shelf life of your food and drinks.

Category

Safe Storage Duration

Reason/ Statistics

Recommend

Hot Beverages

Black Coffee, Tea, Hot Chocolate

4 hours

Bacteria thrive in the "danger zone" (5°C–60°C) after 4–6 hours

Consume within 4 hours for optimal safety

Milk-Based Drinks (e.g. Lattes)

2–4 hours

Dairy spoils quickly, especially in temperatures below 60°C.

Limit storage for milk-containing beverages.

Hot Foods

Soup, Stews
(Non-Cream Based)

Up to 6 hours

USDA recommends keeping hot foods above 60°C for safe consumption.

Avoid prolonged storage to ensure safety.

Cream-Based Soups, Curries

2–4 hours

Dairy and cream spoil faster due to high perishability.

Consume quickly to prevent bacterial growth.

Cold Beverages

Water, Iced Tea, Juices

Up to 12 hours for freshness and safety

Cold drinks without perishable ingredients are less prone to spoilage.

Ensure vacuum insulation is effective to keep contents below 5°C.

Cold Foods

Fresh Salads
(No Dairy-Based Dressing)

2–4 hours

Perishable foods should stay below 5°C; USDA recommends consuming within 4 hours if not refrigerated.

Use ice packs for extended safety.

Fruits and Vegetables

6–8 hours

These are less perishable but should remain chilled for freshness.

Avoid direct sunlight or heat.

What You CANNOT Store in a Vacuum Container

1 | Carbonated Drinks

Avoid store fizzy or carbonated beverages as the pressure can damage the seal or cause spills.

2 | Fermented or Gassy Foods

Foods like kimchi or fizzy beverages can cause pressure buildup.

Product Care Tips
Hand Wash Only

Avoid using a dishwasher

Daily Cleaning

Wash the tumbler or container thoroughly with warm, soapy water after each use to remove residue and prevent odors.

Dry Thoroughly

After washing, let the tumbler or container air dry with the lid off to prevent mold or mildew.

Store with Lid Off

When not in use, store the tumbler with the lid off to allow ventilation and prevent odor build-up.

No Microwave or Oven Use

Never place the tumbler in a microwave or oven, as the vacuum insulation and metallic components can cause damage or hazards.

Avoid Prolonged Exposure to Heat

Don’t leave the tumbler in extreme heat, such as inside a car on a hot day.

No Freezer
Use

Avoid placing the tumbler in a freezer as it may damage the vacuum seal.

No Strong Chemicals

Refrain from using bleach or harsh chemicals for cleaning, as they can corrode or stain the surface.

Disclaimer :
We take pride in providing high-quality vacuum containers to enhance your on-the-go lifestyle. The safety tips and storage guidelines shared here are based on general best practices to help you get the most out of our products. Please follow product instructions and use your best judgment when storing or consuming food and beverages. Your safety and satisfaction are our priority.