Carrying a gravity-reversed box to jump higher is a really cool idea! I was surprised when I found that out.
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Yeah when I first had the idea I was on the fence about whether to put it in, and my initial implementation of it went more for realism by making your jump impart a constant amount of momentum, meaning that not only would you jump higher with inverted boxes… but also lower with normal boxes, but in my opinion that ended up impeding the playability too much, so I was about to scratch the idea entirely, but figured I could just simplify and say that your jump speed stays constant, rather than momentum, so you jump the same height with a normal box and higher with an inverted one.