The last time we saw Bucky Barnes, a.k.a. The Winter Soldier (Sebastian Stan), his metal arm was trapped. Captain America (Chris Evans) and The Falcon (Anthony Mackie) found him this way in the end credits scene of Ant-Man. This scene showed that Bucky is starting to regain some of his memories, providing a tidy segue into Captain America: Civil War, where Bucky will fight alongside Cap, Falcon and the rest of their team. There is still much we don't know about how Bucky evolves in this movie, but there is one aspect of his character some fans have been curious about. Instagram user coleisadreamer reached out to Sebastian Stan on the social media site to ask the actor what is in the backpack he's seen wearing during the trailers. Surprisingly, the actor gave this fan a straight answer. Warning, there may be various spoilers awaiting you throughout this story, so tread with caution.

"In his backpack there are a dozen notebooks that compose the scattered memories dating back to as far as he can remember which somewhat piece together a scattered life. In a similar way to Alzheimer's, he's written things down, for fear of losing his memory again. He was prepared, were something to happen, to walk away with nothing but that backpack, which is why it's the only thing he takes and knowing full well that not everything those pages contain is pretty."

Sebastian Stan made his Marvel Cinematic Universe debut in 2011's Captain America: The First Avenger as Steve Rogers' childhood friend Bucky Barnes. We learned in Captain America: The Winter Soldier that Bucky was captured and brainwashed by Hydra and turned into the seemingly-invincible Winter Soldier. At first, The Winter Soldier has no recollection of his old friend, but in one of the movie's end credit sequences, he's seen visiting a museum exhibit on Captain America, where he's presumably trying to jog his memories.

In the new trailer for Captain America: Civil War that debuted last week, we see The Winter Soldier wearing this backpack as he tries to flee from Black Panther (Chadwick Boseman). While the footage doesn't place any extra emphasis on the backpack, or how important it is to Bucky, these details certainly shed some light into where Bucky's mindset is at leading into this epic superhero showdown. It's clear now that this will be a very important item that fans should pay close attention as we get closer to the May 6 release date.

As of now, we don't know for sure if Sebastian Stan will appear in more Phase Three movies following Captain America: Civil War. There has been speculation that either Bucky or The Falcon may take over the Captain America mantle, after rumors surfaced that Steve Rogers would die in the movie. While we wait for more details, take a look at coleisadreamer's Instagram post and stay tuned for more on Captain America: Civil War.