There are so many of these brand name products that become the name for the entire category.

Kleenex: Often used to refer to any facial tissue

Band-Aid: Commonly used to refer to any adhesive bandage.

Xerox: Used as a verb meaning to photocopy

Velcro: Refers to hook-and-loop fasteners in general.

Thermos: Used to refer to any vacuum flask or insulated bottle.

Dumpster: Originally a brand name for large trash receptacles, now used generically for any large waste container.

Q-tips: Refers to cotton swabs in general.

Frisbee: A term used to describe any flying disc.

Jacuzzi: Often used to refer to any hot tub or whirlpool bath.

ChapStick: Used generically for any lip balm.

Post-it: Refers to any sticky notes.

Escalator: Originally a brand name, now used for any moving staircase.

Popsicle: Refers to any frozen treat on a stick.

Jet Ski: Used to describe any personal watercraft.

I’m sure there are more.