Crate size, supplies

Hello everyone 🙂 I am getting my toller at the end of June and I am starting shopping. When it comes to the room crate and car/travel crate, what size should I get? (It will be a boy) Also, what's your experience with collars and harnesses? Which do you prefer? Or should I get both? We'll do canicross eventually, so I'll definitely need a harness later on, but not necessarily while he's still a puppy. I only had rottweilers before and tollers are smaller and more active, so I am sure it will be different. Thanks!