>>674445also something like an esee izula, or tops msk, or similar knives.
The one I carry, personally, is an ltwk next gen - about the same size as an izula 2, but nicer.
Generally - if you're just opening boxes, you want a nice, sharp point. But if you're breaking down boxes, you might want a beefier handle.
Of course, if you fancy spending ~150 bucks, you can get a powder steel knife, like s30v or better, and they take and hold a very good edge.
Pic related: the delica 4 I mentioned earlier, as well as my other edc knives (next gen and techno).