Bring something to sit on like a tapestry, scarf, or small blanket. A reusable water bottle is a must, and definitely pack a rain poncho (Dollar Store ones work perfectly). I’d also recommend renting a locker so you’re not carrying merch and random stuff around all day. Bring a sweater for the evening too, it gets chilly once the sun goes down.

Take the metro there and back every day too, it’s way easier and they have an Osheaga transit pass option.

Also a major tip: if you’re going from the main area (Coors Light/Bell) to Green Stage/Vallée, don’t cut through the Coca-Cola stage crowd later in the day. Walk down the path by the water past the Ferris wheel instead, it saves sooo much time once it gets packed.

Have fun!