The measurements say 2 inches and it's true. I have a small jumping spider and decided to use it to house it but it's too small even for that. It also feels a bit fragile. The included extras are helpful though and they were honest about the size. If they could make one of those 6x4x4 (6 inches tall) or at least 6x4x2 then it would be perfect for jumping spiders. The most important part will be holding those tight seals so the spiders can't escape.
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