The most I've ever put in the trunk is 3 cases of water and 2 grocery bags. It'll fit more than that but ya gotta lean forward parallel with the trunk opening while holding whatever you intend to place behind the back seat. Not so good for lower back muscles. And I've never folded rear seat, kinda pointless.
If I need more trunk space, I use my '16 Malibu to go shopping.
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