Though it would fit the kobalt mower, it does not.
No, I would not recommend this to a friend.
Response from greenworkstools.comBy Greenworks, May 26, 2026
Hello Cris1122. We are sorry for the confusion and appreciate you calling this out. While the Grass Catcher Bag with Frame (SKU R0201921-00) is designed for select Greenworks 21" lawn mowers, it is not universally compatible with other brands, including Kobalt models, due to differences in deck design, mounting points, and rear discharge openings. Even if sizes appear similar, these variations can prevent a proper fit. To ensure compatibility, we recommend verifying the exact model number of your mower and selecting accessories specifically listed for that unit. If you need help identifying the correct bagger for your mower, Greenworks support can assist with confirming the appropriate part. They can be reached either using the online chat function, on Greenworks Tools page, or by calling 1-888-909-6757.
I do like the light weight, and quite functioning. However, I have tried multiple times/setting to get it to mulch and not leave a mess behind (clumps of non-mulched and missed blades of grass) on my healthy yard, even when barely taking anything off the top. I have reached out to Support and they sent me the "best" blade they have (which looked just like the one it came with), this was of no benefit. I pulled out my ~20+yr old gas mower and it still does a much better job of cutting and mulching than this mower (leaves little to no visible remnants). Maybe it would work better on a yard not as healthy and thick as my small yard. I would recommend looking elsewhere for a battery powered mower.
Pros: Convenient, Easy to Use, Quiet, Environmentally Safe
No, I would not recommend this to a friend.
Response from greenworkstools.comBy Greenworks, May 21, 2026
Hello RGCvik. We are sorry to hear the mulching performance has not met your expectations, especially since you have already taken the time to try different settings and even worked with support on a blade replacement. While it is good to hear you are enjoying the lighter weight and quiet operation, clumping and visible clippings can occur when grass conditions are too heavy, damp, or when too much is cut in a single pass, even on healthy lawns. For best mulching results, we recommend mowing more frequently and ensuring no more than one-third of the grass height is removed per cut, as well as confirming the mower is set to the correct mulching configuration with a clean, properly installed blade. Cutting at a slightly higher deck setting and reducing ground speed can also help improve airflow and clipping circulation under the deck. That said, we understand your comparison to a gas mower and appreciate your candid feedback. If you would like additional support or a technical review of your unit’s performance, the Greenworks Tools customer success team is available to help further. They can be reached either using the online chat function, on Greenworks Tools page, or by calling 1-888-909-6757.
[This review was collected as part of a promotion.] This is a well designed blade with a balance construction and sharp edges for quality lawn care. It’s also well coated with green powder coated paint for corrosion resistance and durability. I highly recommend the green works blade over a regular box store brand.
Pros: Easy to Use, Quiet, Durable, Effective, Powerful