Both space wise seem fine to use with like a 2" or so tarantula. The first one does not look like the lid locks. Lid appears to be on hinges near the light but does not snap shut or anything which I personally do not feel comfortable with using something like even with new world T's and if your thinking of putting an OBT in there I would definitely pass unless you figure out a way to get the lid to snap shut I would pass on the first one. The second way seems bigger as I can see the measurements given. The first one only tells you how big it is in liters so I imagine it is smaller but I don't know that for sure. If they are plastic you can melt or drill extra small holes on the sides for cross ventilation if needed. If the 6" height on the second one seems too tall you can always just add more substrate in it to get it to work.
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