FAQs | CupCraze Vacuum Flasks

How do I clean my CupCraze vacuum flask?

Cleaning your CupCraze flask is quick and easy. Rinse the interior and exterior with warm, soapy water, then use a soft bottle brush to gently scrub away any residue—pay extra attention to the lid and seal to avoid buildup. Pro tip: For tough stains or odors, soak the flask in a mixture of warm water and baking soda for 30 minutes before rinsing. Avoid harsh chemicals, abrasive scrubbers, or bleach, as these can damage the stainless steel finish and insulation.

Can I use my CupCraze flask for carbonated beverages?

We don’t recommend using CupCraze flasks for sodas, sparkling water, or any carbonated drinks. The pressure from carbonation can build up inside the sealed flask, which may weaken the leak-proof seal over time and cause spills. Stick to non-carbonated hot or cold beverages (coffee, tea, water, smoothies) for the best performance and longevity.

Are CupCraze vacuum flasks dishwasher-safe?

To protect the insulation and finish of your CupCraze flask, we strongly recommend hand washing for all models. While the stainless steel body may be dishwasher-tolerant, the lid’s rubber seals and vacuum insulation can degrade in high heat or harsh dishwasher detergents. Hand washing ensures your flask maintains its temperature-locking power and leak-proof design for years to come.

Can I store food in my CupCraze vacuum flask?

CupCraze flasks are designed primarily for liquids, but they work great for liquid-based foods like soups, stews, oatmeal, or chili—perfect for on-the-go meals! The double-walled insulation will keep your savory dishes hot for hours. Avoid storing dry or solid foods (like nuts or snacks), as they can leave crumbs in the narrow neck and are hard to clean thoroughly. Always check the flask’s capacity to ensure it fits your portion size.

How long does a CupCraze flask keep beverages hot or cold?

Our double-walled stainless steel insulation delivers industry-leading performance:

Hot drinks (coffee, tea, cocoa): Stay piping hot for 12+ hours
Cold drinks (water, iced tea, smoothies): Stay ice-cold for 24+ hours

Note: Performance may vary slightly based on the size of the flask, initial temperature of the beverage, and how often you open the lid. For best results, pre-heat or pre-chill the flask with hot/cold water for 5 minutes before adding your drink.

Can I customize my CupCraze flask with logos or designs?

Absolutely! CupCraze offers custom engraving and printing services for personalization or branding. Add your name, favorite quote, team logo, or company design to make your flask one-of-a-kind. Customization is available for individual orders and bulk purchases—perfect for gifts, corporate swag, or team gear. Reach out to our customer support team for pricing, design guidelines, and turnaround times.