Raven’s power is to open a portal to a separate dimension, where he can store pretty much anything. Including snacks for Alice, of course. This ability to open a portal in space is similar to Liatris wormhole creation, but he can only create a path between his current location, and the alternate dimension. He can’t teleport like Liatris can. However, he can let his companions hide in his space while he heads for a safer place.
Stig really doesn’t want to hide in there, though. Don’t ask why. Maybe it’s a toxic masculinity thing. I mean, it probably is.