Vacation: We accrue a certain number of hours per pay period, based on seniority, up to something like 30 days of vacation.
Holidays: We accrue at something like 3.xx hours per 2-week pay period, up to a 40 hour bank. there are 6 recognized holidays here, remaining time gets used at our own discretion. (Sick, Vacation, whatever)...so long as one doesn't throw away accrual time by going over the bank amount, it's like having another 5 days of vacation
Sick: Totally unlimited accrual. HR rationalizes that it makes up for the fact that we don't have short-term disability....even though it would take me years to accrue enough sick time to cover 6-months pay before long-term kicked in.