# CANTOO Hard Case for MX Master 3/3S: Fit, Limits, Who Should Skip > 86g molded EVA case for MX Master 3/3S/2S. Tags: logitech, mx-master-3, travel-case, eva, mouse-accessory, cantoo Source: https://www.amazon.co.jp/dp/B09ZPHP1K5 Article page: https://web-autoai.com/articles/cantoo-logitech-mx-master-3?lang=en Prices and ratings change over time — check the article page for the current values. --- The CANTOO ハードトラベルマウスケース Logitech MX Master 3 is a deliberately unglamorous accessory: it exists so the mouse you already own survives the commute. This article covers exactly which models fit, when the protection actually matters, and the pitfalls buyers discover after the box arrives. ## Overview The CANTOO Hard Travel Mouse Case is molded specifically for Logitech's MX Master line: MX Master 3, MX Master 3S, Master 2S, and MX Master Advanced. The shell is EVA (ethylene-vinyl acetate), giving it impact resistance, dust resistance, and water resistance. The case itself weighs 86g — lighter than the mouse it carries. The short verdict: this product earns its keep if you currently toss an MX Master loose into a bag. The MX Master has a lot of moving parts — main wheel, thumb wheel, side buttons, gesture button — and pressure from other items in a backpack can trigger phantom clicks that drain the battery, or scuff the top shell. If your mouse lives permanently on a desk and never leaves, this is just one more box to store. That is worth saying plainly. ## Who This Is For, In 30 Seconds | Your situation | Verdict | | --- | --- | | Carry the MX Master between home and office weekly | Strong fit — secures the moving parts | | Pack it in a suitcase for trips | Strong fit — the shell resists crushing pressure | | Mouse never leaves the desk | Skip it | | You use MX Anywhere or a smaller model | Not compatible | | You want cables and a charger in the same case | Too small — the interior pocket is for tiny items | Don't stop at the table. What matters more than how often you travel is how you pack. If the mouse already rides inside a padded laptop sleeve, the marginal benefit is small. If it sits at the bottom of a rigid backpack next to a charger and a notebook, the hard shell matters a lot. ## Compatibility Guide Official compatibility covers four models: MX Master 3, MX Master 3S, Master 2S, and MX Master Advanced. The interior is shaped around the MX Master's asymmetric silhouette, so "close enough in size" is not a safe assumption for anything outside that list. Practical notes when checking fit: - **MX Master 3 and 3S share a chassis.** The 3S changed the sensor, the wheel, and the click noise, but the exterior is the same for fitting purposes. - **Master 2S** is an older generation but close enough in shape to be listed. If the wheel area feels tight on your unit, test the fit before forcing it shut. - **MX Anywhere 2/3/3S, Lift, and the M575 trackball are not compatible.** MX Anywhere is the most common mix-up because of the similar naming. - **Newer generations such as an MX Master 4** are not on the compatibility list, so this article cannot claim they fit. Check the seller's current compatibility list before ordering. The case contains no electronics, so connectivity and OS are irrelevant. Windows, macOS, Linux, ChromeOS — it makes no difference, and it doesn't matter whether you pair over Bluetooth or a Logi Bolt receiver. The real clearance problem is your bag, not the case. The MX Master is a large ergonomic mouse, roughly 85mm wide, 125mm deep, and around 51mm tall depending on generation. The case wraps another layer around that, so it often will not slide into the inner pocket of a slim laptop sleeve. Measure your bag's interior before buying. ## Product Info | Spec | Value | | --- | --- | | Material | EVA | | Weight | 86g | | Compatible mice | Logitech MX Master 3 / MX Master 3S / Master 2S / MX Master Advance | | Color | Black | | Water resistance | Yes | Check the retailer's page for the latest price. That is reasonable for a dedicated case, but accessories like this move with coupons and sales while articles stay frozen — check the product page for the current figure. Marketplace listings vary per seller, so no marketplace price is quoted here. Read the "water resistance: yes" spec conservatively. An EVA shell with a zipper closure shrugs off rain and a spilled drink; it is not a submersion rating. With no IP rating published, treat it as splash resistance only. ## What Actually Matters In Daily Use The interior combines a raised bubble pattern that grips the mouse and a small compartment on the underside. Three practical consequences follow. First, **the mouse doesn't slide around inside. ** A hard shell is pointless if the contents rattle into the walls on impact; the value of custom molding is immobility more than armor. Second, **the accessory pocket is modest** — a receiver and a short cable fit, a coiled USB-C cable plus a charger do not. Third, **bulk is the real cost. ** 86g is nothing, but the packed volume is roughly 1.5× the mouse alone. One caution if you store the receiver in the pocket: a Logi Bolt receiver is barely over a centimeter long and is miserable to find once dropped on a floor. If your mouse has an internal receiver slot, leave it there instead. ## Best Use Cases - **Hybrid workers moving between home and an office or coworking space.** Daily in-and-out of a bag is exactly the scenario this case is built for. - **Frequent business travelers.** Suitcases apply vertical pressure, and a bare mouse can arrive with a side button held down and the battery drained. - **Video editors and designers who depend on the MX Master's wheel.** If you insist on the same input device wherever you work, protecting the commute is part of protecting the tool. - **Anyone managing shared or loaned equipment.** Gear in a case simply gets handled more carefully than gear rolling around a desk. It is a poor fit for **desk-only users, MX Anywhere owners, and people who want one pouch for several devices. ** For that last group, the custom molding works against you — a generic gadget pouch is more useful. ## Things to Consider First, the obvious one: **this is the case only — no mouse included. ** The product photos show an MX Master, and some buyers read the price as covering the mouse. Second, **model compatibility is where purchases go wrong. ** MX Anywhere, Lift, MX Vertical, and third-party ergonomic mice do not fit. "It's a big Logitech mouse, so it should work" is not a safe inference. Your exact model number is on the underside label or in Logi Options+. Third, **EVA does not like heat. ** Leaving the case on a car dashboard in summer or on a sunlit windowsill for months can warp it, and a warped shell no longer holds the mouse securely. Store it at room temperature, out of direct sun. Fourth, **the zipper is the consumable part. ** With daily use, expect the slider or pull to show wear over a few years. On hard cases generally, failure starts at the zipper, not the shell — avoid yanking it at an angle and never let a cable get caught in the track. Return and warranty terms depend on the seller, and Logitech's warranty obviously does not extend to a third-party accessory. If you are unsure about fit, buy from a seller with a return window. One last point: Amazon listing metadata — manufacturer, brand, model number — occasionally disagrees with the actual product. In this listing the ASIN and manufacturer both read CANTOO and are consistent, but make it a habit to **verify the product from the images and title** rather than trusting the registered details block alone. Buyers who rely on that block sometimes receive a different color or generation than expected. ## FAQ **Q: Does it fit the MX Master 3S? ** A: Yes. The 3S shares its chassis with the MX Master 3 and is explicitly listed as compatible. **Q: Where does the USB receiver go? ** A: There is a small compartment on the underside of the case for the receiver or a short cable. Because the receiver is easy to lose, using the mouse's internal slot is safer if it has one. **Q: Will an MX Anywhere 3 fit? ** A: No. The MX Anywhere form factor is substantially different and won't seat in the molded interior. This case is MX Master only. **Q: Can I pack a charging cable or a hub too? ** A: A short USB cable fits. A charger or hub does not — pair the case with a separate gadget pouch if you carry more. **Q: It says water resistant. A: Treat it as splash resistance. With no published IP rating, there is no guarantee against submersion. Wipe it down and let it dry before storage. **Q: Is 86g noticeable in a bag? ** A: Not really — it weighs less than the mouse. The bulk it occupies is a bigger consideration than the weight. ### Product Disclosure (Amazon) - Manufacturer: CANTOO - Seller: Amazon US - Fulfilled by: Amazon US - ASIN: B09ZPHP1K5 - Note: This article covers a manufacturer-made product based on Amazon listing details.