Wine bottle with messages from the raft
Surviving members of Oceanic 815 write messages on slips of paper, inserted in the bottle and give to the members attempting the raft getaway, in the episode, "Exodus, Part 1." Later found in Season Two washed ashore following the destruction of the raft.

Related content:
EPISODE RECAP - "Exodus, Pt. 1"
EPISODE RECAP - "Exodus, Pt. 2"
EPISODE RECAP - "...And Found"
EPISODE RECAP - "Everybody Hates Hugo"