Zojirushi
Zojirushi SM-SF48 Travel Mug
The Zojirushi SM-SF48 is a vacuum-insulated stainless steel travel mug designed for all-day hot or cold beverage retention.
## Zojirushi SM-SF48 Stainless Mug (16 oz.)
---
## Overview
The Zojirushi SM-SF48 is a stainless steel vacuum-insulated travel mug with a 16 oz. (0.48 liter) capacity designed for everyday on-the-go use. It features a lightweight design for added portability, with a tight-fitted flip-open lid and safety lock that makes drinking easy while preventing spills. Backed by Zojirushi's long-standing reputation in thermal products, the brand is a world-class manufacturer of vacuum-insulated thermal mugs and bottles, established in Japan in 1918.
---
## Standout Features
- **Double-Wall Vacuum Insulation:** Air between the outer and inner layers of stainless steel is removed to create a vacuum that blocks heat transfer through conduction. A copper or aluminum layer wrapped around the inner stainless steel layer further reflects heat (radiation), minimizing temperature change in your drink.
- **Verified Temperature Retention:** Heat retention is rated at 189°F at 1 hour and 160°F at 6 hours; cold retention is rated at 46°F at 6 hours.
- **One-Touch Flip Lid with Safety Lock:** The tight-fitted flip-open lid with a safety lock makes drinking easy and prevents beverages from spilling. An air vent on the mouthpiece allows beverages to flow out smoothly, without gushing or overflowing.
- **2-Step Lid Release:** The 2-step lid release process prevents excess condensation on the stopper from being flung off while the lid opens.
- **Ultra-Lightweight & Compact Build:** A special manufacturing technique was used to make the body ultra-lightweight and compact. Dimensions are 2-5/8 x 2-7/8 x 8-3/4 inches.
- **Easy-to-Clean Interior:** The interior features a nonstick coating, and the stopper disassembles for thorough cleaning.
- **BPA-Free Materials:** Made of BPA-free plastic and stainless steel.
- **5-Year Warranty on Heat Retention:** Zojirushi offers a 5-year warranty on stainless steel vacuum heat retention.
- **Color Options:** Available in Navy, Pale Pink, and Mint Blue.
---
## Who It's For
The SM-SF48 is well-suited for commuters, office workers, and students who want a reliable, no-fuss travel mug that won't leak in a bag. Its lightweight and compact form makes it ideal for easy one-handed operation. At 16 oz., it's a practical size for a single serving of coffee, tea, or a cold beverage — not too bulky, but enough to get through a morning commute or a work session.
---
## Important Considerations
- **Capacity is modest:** At 16 oz., this mug holds less than many competing travel mugs (which often come in 20–24 oz. sizes). If you prefer larger servings, Zojirushi does offer a 20 oz. version (SM-SF60). The SM-SF series is available in 16 or 20 oz. capacity.
- **Mouth opening is narrow:** The mouth opening is 1-5/8" (4 cm) wide, which may make it difficult to add ice cubes or clean with a standard bottle brush.
- **Not dishwasher safe:** Like most vacuum-insulated mugs, hand washing is recommended to preserve the insulation and lid components. Always check the included instruction manual for care details.
- **Lid design, not a screw-top:** The flip-open lid is convenient for one-handed drinking, but buyers who prefer a fully sealed screw-top lid for maximum leak protection during vigorous activity (e.g., cycling, hiking) may want to consider that trade-off.
- **Warranty geography:** Zojirushi's thermal insulation warranty covers defects for five years from the date of original retail purchase, but the product must be used within the US and Canada.
- **Not suitable for carbonated beverages:** As with virtually all vacuum-insulated mugs with flip-top lids, carbonated drinks are not recommended due to pressure build-up risks.
Key features
- Vacuum-insulated stainless steel
- 5-hour heat retention
- leak-proof lid
Seen at 3 retailers from $29.99 to $37.01 as of 2026-03-01. Prices change — check the retailer for the current price.
Zojirushi's engineering pedigree shows in a lid that genuinely doesn't leak and insulation that holds temperature long after rivals have given up.
What stands out
- Vacuum insulation keeps hot drinks hot for up to 5 hours, well above the category average for similarly sized mugs.
- Leak-proof lid design makes it a reliable choice for bags and commutes without the anxiety of spills.
- Stainless steel construction resists odours and staining better than plastic-lined alternatives.
- Zojirushi has a long track record of quality control, and build consistency is generally high across its travel mug line.
What to weigh
- Zojirushi mugs typically sit at a price premium over generic stainless steel competitors.
- Narrow-mouth designs common to this line can make thorough cleaning and ice-cube loading less convenient.
- The lid mechanism, while secure, can require both hands to operate — less ideal when driving.
Great fit if
- Commuters who need a genuinely leak-proof mug for bag carry.
- Anyone who drinks slowly and wants beverages to stay at temperature through a long morning.
- Those willing to pay more for reliable build quality and brand consistency.
Skip it if
- Shoppers on a tight budget who are happy with basic insulation performance.
- People who prefer wide-mouth mugs for easy filling and cleaning.
- Cold-brew or iced-drink drinkers who need to drop large ice cubes in quickly.