I like ribbon style hair ties (like these). They’re less bulky than scrunchies and come in a zillion colours. I have some that match my hair colour for a more invisible look and some with glitter or cool designs to add glam. I have fine hair so go for ones with a bit of texture to the fabric so they don’t slip out. I don’t find them strong enough to hold up high ponytails but low styles and ends of braids work well.