Grass Catchers USA is an online retailer specializing in grass collection systems and replacement bags for lawn mowers. Developed by Humboldt Specialty Manufacturing Company, the business offers complete, original Humboldt collection systems designed for a wide range of mower brands and models. Its products include rear catchers in multiple bag and capacity configurations, dedicated and fabric dump-from-seat systems, dump-from-seat attachments, the F2 Tornado rear hopper, and T-style multiple-capacity side catchers.

The site also sells replacement grass catcher bags, which it describes as comparable or superior to original mower bags and available at low online prices. Compatible brands listed include Humboldt, Dixon, Echo/Stihl, Exmark, Grasshopper, Honda, John Deere, Lawn Boy, MTD, Murray, Snapper, Toro, and Troybilt. Mower-specific collection options are organized for manufacturers such as Bad Boy, Big Dog, Bobcat, Cub Cadet, Hustler, Land Pride, Massey, and Spartan, among others. Based in Omaha, Nebraska, Humboldt Specialty Manufacturing provides customer assistance by phone, fax, and email during weekday business hours.