Why are the dimensions lacking the z? The pictures make it appear some sizes are just bags while others are box shaped. It would be nice to have more info on the sizes.
@ThunderThighs Definitely correct me if I’m wrong here, but these were the specs listed on the item:
Please be mindful that order options come in different combinations with different size variations. Definitely reference here before ordering. 
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The provided list shows two dimensions, but the “bags” have three. Rather important to know all three if I want to know how they will fit in my storage area.
Hi there. I asked for more information this morning but we haven’t heard back from the vendor. Sorry.
Update: just heard back. These are flat bags so there’s no height measurement.