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Yes, reusable cups can release microplastics, but the available comparison does not show that every reusable cup sheds them—or that any cup is entirely particle-free. A 2025 study reported fewer microplastics from the reusable cups it tested than from the single-use cups in its comparison. For everyday care, wash a reusable cup regularly with hot water and washing-up liquid, use a dishwasher only if the manufacturer approves it, and dry it thoroughly.
What research says about microplastics from reusable cups
The 2025 comparison found lower microplastic release from its tested reusable cups than from its tested single-use cups. That result applies to the products and conditions in the study; it does not establish that all reusable cups release fewer particles, rank every reusable-cup material, or prove that reusable cups never shed microplastics. The study abstract does not provide a universal material ranking or a reusable-cup particle count. Read the study abstract.
It is important not to confuse that comparison with a separate 2024 study of disposable cups. Akbulut and colleagues tested single-use polypropylene, polystyrene, expanded-polystyrene and polyethylene-coated paper cups—not reusable cups. Across the study’s selected water temperatures and contact times, measured release ranged from 126 to 1,420 particles per litre. The highest value came from a polypropylene cup tested with water at 50 °C for 20 minutes; the lowest came from a polyethylene-coated paper cup with water at 4 °C and zero-minute contact. These results describe those disposable cups under those test conditions, not what to expect from a reusable cup. Read the single-use cup study.
The same disposable-cup study reported 52–65% lower particle counts after the cups were pre-rinsed with ultrapure water. That was a pre-test treatment for the tested single-use cups, not a validated cleaning method for reusable cups. It does not show that rinsing a reusable cup removes microplastics.
#1 Best Overall
- Read Before You Buy — No Video Output: These adapters support charging and USB 2.0 data transfer, but cannot transmit video signals. Except for standard USB webcams (which use USB data only), they are not compatible with HDMI/DisplayPort cables, video-capable USB-C hubs, or docking stations with video output.
- Convert USB-A Ports to USB-C: Designed to connect USB-C earphones, cables, flash drives, card readers, and other USB-C accessories to standard USB-A ports. Plug-and-play with no drivers or software required.
- Aluminum Alloy Housing: Built with a sturdy aluminum alloy shell that aids in heat dissipation and protects against daily wear and scratches. Designed to maintain a stable and secure connection.
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- 12-Month Warranty: Backed by a 12-month manufacturer warranty for peace of mind. Designed to meet strict quality control standards for reliable everyday performance.
How to choose and inspect a reusable cup
Rather than relying on a claim that a particular material is “microplastic-free,” compare cups by how easily they can be cleaned, whether their surface is smooth, and whether their care instructions fit your use. Germany’s Federal Institute for Risk Assessment (BfR) lists smooth, easy-to-clean porcelain, stainless steel, rigid temperature-stable plastics and glass as suitable materials when they comply with food-contact rules. This is guidance on suitability and cleanability, not a ranking of microplastic shedding. See BfR’s reusable-cup FAQ.
- Check the manufacturer’s instructions for dishwasher, heat and microwave compatibility.
- Inspect the inside and rim for roughness, hairline cracks or visible wear.
- Stop using the cup once its surface is no longer smooth or shows cracks or wear. BfR advises using reusable cups only while their surfaces remain smooth and free of hairline cracks and visible wear.
Take care with cups marketed as bamboo
Some cups promoted as bamboo or made from natural materials are melamine-formaldehyde plastic containing plant fillers. BfR warns that hot or acidic drinks can cause melamine and formaldehyde to migrate from melamine-formaldehyde articles. Do not use these cups for hot coffee or tea; follow the product’s instructions for other uses.
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- 5-in-1 USB-C Hub: Experience comprehensive connectivity featuring a Power Delivery input, two USB-A 2.0 ports, a USB-A 3.0 port, and an HDMI port. (Note: The USB-C power delivery input port is only for connecting an external wall charger to power your laptop and cannot power peripheral devices.)
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How to clean a reusable cup safely
- Wash it regularly. Use hot water and washing-up liquid. Clean a visibly dirty cup before refilling it.
- Use a dishwasher only when approved. Check the manufacturer’s instructions first; not every reusable cup is dishwasher-safe.
- Dry it completely. Dry the cup thoroughly with a clean method or leave it to dry fully before storing or using it again.
- Follow the care instructions. Observe the maker’s limits for heat, cleaning and microwave use. Do not put hot or acidic drinks in melamine-formaldehyde cups.
- Keep the drinking surface clean during refills. At self-service machines, avoid letting your cup touch the dispensing nozzle.
- Replace damaged cups. Retire a cup if its surface becomes rough, cracked or visibly worn.
These steps are routine hygiene advice; they are not a guarantee that a cup will release no particles. BfR recommends regular washing with hot water and washing-up liquid, or dishwasher cleaning when the manufacturer says it is suitable, followed by thorough drying. BfR’s cleaning guidance.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Microplastics are not the only material-safety question
Reusable food-contact items can be made from plastic, stainless steel, silicone and other materials. The Netherlands’ National Institute for Public Health and the Environment (RIVM) inventoried commonly used materials and prioritized 20 substances for targeted follow-up research based on toxicological potential and the potential to be released into food. That inventory is not evidence that every identified substance is released from every cup at harmful levels. RIVM also reports that regular cleaning makes bacterial illness from reusable food-contact items unlikely, while sharing a drinking container can raise the hygiene concern. Read RIVM’s inventory.
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Quick Recap
Best Value
- 5-in-1 Connectivity: Equipped with a 4K HDMI port, a 5 Gbps USB-C data port, two 5 Gbps USB-A ports, and a USB C 100W PD-IN port. Note: The USB C 100W PD-IN port supports only charging and does not support data transfer devices such as headphones or speakers.
- Powerful Pass-Through Charging: Supports up to 85W pass-through charging so you can power up your laptop while you use the hub. Note: Pass-through charging requires a charger (not included). Note: To achieve full power for iPad, we recommend using a 45W wall charger.
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- HD Display: Connect to the HDMI port to stream or mirror content to an external monitor in resolutions of up to 4K@30Hz. Note: The USB-C ports do not support video output.
- What You Get: Anker 332 USB-C Hub (5-in-1), welcome guide, our worry-free 18-month warranty, and friendly customer service.
Rank #4
- Dual Converters, Infinite Potential：Includes 2× USB C male to USB A female adapters and 2× USB A male to USB C female adapters. Perfect for a wide range of uses—tablets with Bluetooth keyboards, expand USB ports on macbook, and more. Two different converters for all your daily needs
- Next-Level 10Gbps & 3A Charging: No more slow 480Mbps, this usb to usb c adapter has a transfer speed of up to 10Gbps, allowing you to do more transferring in less time. This usb adapter fits both USB A and USB C charger, supporting up to 3A fast charging
- Upgraded Exquisite Craftsmanship: With an aluminum alloy housing and metal connector, the usbc to usb adapter is extremely durable and sturdy. Rigorously tested to withstand more than 10,000 times of plugging and unplugging, ensuring long-lasting performance
- Broad Compatible: The usb c to usb adapter widely supports all USB C/ USB A devices like laptops, tablets, cellphones, car chargers, and phone chargers. Such as compatible with MacBook Pro/Air 2023/2022, Thunderbolt 4/3 Devices,Apple MagSafe Watch 9/8/7/SE/Ultra, iPad Pro 2022/2021, Samsung Galaxy S23/S20/S10, and iPhone 17/16/15 Pro. Plug and play
- Please Note: To reach 10Gbps speed, keep the cable under 3.3 ft. For USB A Male to USB C adapters, try flipping the USB C connector. USB C Male to USB A adapters support bidirectional 10Gbps transfer within 3.3 ft
Rank #3
- Sleek 7-in-1 USB-C Hub: Features an HDMI port, two USB-A 3.0 ports, and a USB-C data port, each providing 5Gbps transfer speeds. It also includes a USB-C PD input port for charging up to 100W and dual SD and TF card slots, all in a compact design.
- Flawless 4K@60Hz Video with HDMI: Delivers exceptional clarity and smoothness with its 4K@60Hz HDMI port, making it ideal for high-definition presentations and entertainment. (Note: Only the HDMI port supports video projection; the USB-C port is for data transfer only.)
- Double Up on Efficiency: The two USB-A 3.0 ports and a USB-C port support a fast 5Gbps data rate, significantly boosting your transfer speeds and improving productivity.
- Fast and Reliable 85W Charging: Offers high-capacity, speedy charging for laptops up to 85W, so you spend less time tethered to an outlet and more time being productive.
- What You Get: Anker USB-C Hub (7-in-1), welcome guide, 18-month warranty, and our friendly customer service.
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