What is the difference between the MPB-30 and MPB-20 back pack?

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What is the difference between the MPB-30 and MPB-20 backpack?

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Hi Dennis,

The primary difference is in the quality of the material. MBP-20 is made of a durable 600D Polyester while the MBP-30 is made of a higher-quality, multi-layer laminate sail cloth.