Amazing Spider-Man (1963) #258 VF/NM 1st Appearance of Bag Man costume

The Sinister Secret of Spider-Man’s New Costume!

At last, the answer to the question on everybody's minds: Just what makes Spidey's new costume work? Reed Richards is going to find out—and you will too if you read this issue! This Marvel milestone also guest-stars the Human Torch.

Reed Richards discovers Spider-Man's black costume is an alien symbiote. Debut of Spider-Man’s Bombastic Bag Man costume, a temporary disguise consisting of a Fantastic Four uniform with a brown paper bag for a mask