It’s the difference between a couch you can slouch into for movie night and one that you (and friends) can sit upright in while chatting over cocktails. Overall depth is less important than the dimension from the front of the seat cushion to the front of the back pillow. Here, a cheat sheet:

18 Inches Deep: Looks cool and modern, but nobody will call this cozy.

22 Inches Deep: Minimum depth for sitting comfortably, but still sleek.

24 Inches Deep: Just deep enough for lying down (solo).

33 Inches Deep: That sink-into-it feel that makes you say, “Maybe I’ll just sleep here tonight.”

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