Is there more than one version of the Underground backpack?

There's a good sale at an online retailer but their picture looks slightly different than most others I've seen. On some bags, for example, I've seen "07" or "II" tacked onto the name. I'd assume it's the same but the price is better than anywhere else, so it makes me suspicious. Thanks.

Oh, also, which is larger, the Datadump or the Underground? I prefer a slimmer backpack and I now either will fit my laptop.
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