Like the idea of the hydroflask bottle. Usually, gear like knee/elbow pads is provided. Nicer sport headbands? Guys or girls? Biofreeze, heat pack, cool pack for injuries?
DD does a gift exchange with her soccer team. Our go to is always ear warming headband, gloves, and a small throw that can all be used on the sidelines during games-high school goes from November to January here.
Another gift DD received from a dear friend on and off the soccer field was a hand painted sign with a phrase particular to soccer painted on it. "A goalkeeper can not win a game, she can only save it."
Is there a team mantra or slogan that can be printed on something as a gift?