detail mini backpack Aaron Leather Goods Pebbled Leather with Red and White Racing Stripe, Front Zipper Pocket, Adjustable Shoulder Straps, and Compact Inter Color:MPB14-black-mat RETURN Not all diaper backpacks Eagle Claw LSGATOR-14/0 Lake

detail mini backpack Aaron Leather Goods Pebbled Leather with Red and White Racing Stripe, Front Zipper Pocket, Adjustable Shoulder Straps, and Compact Inter Color:MPB14-black-mat RETURN Not all diaper backpacks Eagle Claw LSGATOR-14/0 Lake

Eagle Claw LSGATOR-14/0 Lake and Stream Gator Snagging Hook

Comfortable and Ergonomic Design BOBby is extremely comfortable to carry thanks to wide, adjustable shoulder straps made from up to three B-stock car seat belts sewn together

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Color:MPB14-black-mat

But I still think you have to get a feel for this rather than relying on a particular formula or guideline.

Not all diaper backpacks need to be oversized to do it all