REDUCE Aspen 20oz Vacuum-Insulated Borosilicate Glass Tumbler — Extra-Wide Straw & Lid

REDUCE Aspen is a 20oz vacuum-insulated borosilicate glass tumbler with a soft base, dishwasher-safe sleeve, and an extra-wide straw and lid designed for cold drinks and thick beverages.

This tumbler combines the clarity and flavor-preserving qualities of borosilicate glass with a vacuum-insulated sleeve to keep cold drinks chilled for hours while protecting surfaces with a Soft Sit™ base. It’s built for people who want a reusable glass option that accommodates thicker drinks like smoothies and boba, fits most cup holders, and simplifies cleanup with dishwasher-safe components.

How long will my drink stay cold in the REDUCE Aspen?

The Aspen’s vacuum-insulated sleeve helps maintain cold temperatures for up to 12 hours, so iced coffee and smoothies stay refreshing through your commute or a long workday. The borosilicate glass preserves flavor without imparting odors, giving a clean taste to every sip.

• Vacuum insulation combined with glass keeps cold beverages chilled up to 12 hours.
• Borosilicate glass resists flavor transfer and thermal shock.
• Lid and straw reduce exposure to warm air, extending cooling time.

Can I use the Aspen for thick drinks like boba and smoothies?

Yes — the Aspen includes an extra-wide straw specifically sized for boba pearls, chunky smoothies, or protein blends so you can sip without clogging. The straw and lid are designed to interchangeably fit the glass and the insulated sleeve for convenience.

• Extra-wide straw accommodates tapioca pearls and dense smoothies.
• Lid seals securely to prevent spills while drinking thick beverages.
• Straw and lid fit both the glass and the insulated sleeve for flexibility.

Is the Aspen safe and easy to clean?

The Aspen is made from BPA-free materials and durable borosilicate glass, offering a safer alternative to some plastic bottles. Most parts are dishwasher-safe; the design intentionally separates the glass from the insulating sleeve so both can be cleaned thoroughly.

• BPA-free components for everyday use.
• Borosilicate glass is dishwasher-safe and resists staining and odor retention.
• Detachable sleeve and lid enable easy, hygienic cleaning.

Will the tumbler protect my furniture and fit in my car?

The Soft Sit™ base cushions impact to prevent marks and clattering on tables, and the insulated sleeve makes the tumbler cupholder-friendly. Its 20oz size balances carrying capacity with practical fit for most standard cup holders and desk spaces.

• Soft Sit™ base prevents scratching and reduces noise on hard surfaces.
• Insulated sleeve improves grip and fits most cup holders.
• 20oz capacity provides ample volume without being bulky.

Who is this for: The REDUCE Aspen 20oz tumbler is ideal for commuters, students, fitness enthusiasts, and anyone who prefers glass for taste purity but needs the practicality of insulation and a wide straw. Choose this tumbler if you want a reusable glass option that handles thick beverages, protects surfaces, fits cup holders, and simplifies washing without sacrificing style or function.