Balazs Lazer Speed Bag Sizing

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I recently purchased a Balazs Lazer speed bag, size large, 11 x 8, through Amazon. It looks like a nice bag but it is smaller than I expected.

I carfeully measured it and found:
Length from bottom of bag to top, including the loop = 11 inches
Length from bottom of bag to top, excluding the loop = 10 inches
Circumference at widest region = 23 inches
Diameter at widest region = 7.3 inches

This is about what I would expect for a 10 x 7 bag, not an 11 x 8 bag.

Does anyone else have experience with Balazs Lazer speed bag sizing?

Thanks for your help.