All adult sized here, 1 DH and 3 females (I think this makes a difference - just seen the accoutrements the teens need to take 😂).
We have 3 medium cases and one small hold-all. All fit to busting.
2 weeks in the sun. Quite a dressy place.
Also, DH takes a clean t-shirt for every day and night and 4 pairs of shoes/trainers plus 2 flip flops and 3 (yes, 3) types of shaver......