I use a Calumet 8000 Series 5 carbon fiber monopod. It is relatively light in weight, sturdy and it collapses short enough to pack in my carry-on luggage.
I top this pod with a Kirk Monopod Tilt head.
If I were to buy now, I would seriously look into a Sirui monopod and tilt head.
My pod was not terribly expensive but the tilt head cost $200 USD. There was really no other choice when I purchased it...
I like tilt heads but not ball heads for monopod use, I don't like the monopods with the tripod type foot because it just adds weight and bulk to the monopod.
However, for sports, I prefer the clamp type extension rather than the twist type simply because it adjusts faster.
I used to kneel (getting too old at 78 to kneel now) with a long lens on a body mounted on the tripod and a shorter telephoto on a second body. The ideal combo would be a pair of 1DX (series) cameras with a 400mm f/2.8 IS on the monopod and a 70-200mm f/2.8 IS lens on the second body.
However, since I was not shooting for pay, my outfit comprised the 300mm f/4L IS lens on a 7D body and a 70-200mm f/4L IS lens on the second 7D body. This is a poor mans sports setup.
BTW: when shooting sports, don't forget a pair of knee pads. They make kneeling much easier. This is one of the best basic sports (in this case American Football) YouTube video.