Transition day chaos - anyone have tips?

Transition days are just the worst at my house. My kids (7 and 10) get weird and argumentative, they're never ready when I pick them up, they fight about what to bring, it's just chaos. Not their fault—I know transitions are hard on kids—but man it makes my stress spike. Does anyone have routines that actually help smooth this out? Packing the night before? Special snacks? Visual schedules? I'm open to anything honestly.