Can this hold an external battery pack? ie. Anker

That would depend on the size. That being said, it is designed to hold a wide variety of items, maybe open the expanded view and take a good look at you options. As for the weight, i don't see that there would be any issue.

How large is the back pocket? I'm trying to see if I can use the back pocket to hold a 10.3x6.6 inch tablet.

Beware! They don't all have zippered pockets! Mine did not!

Can it fit an iPad Pro 13 inches in the back sleeve?

It might, however it would be a squeeze to get it in and out if the pouch. The zipper does not run along the outside edge of the organizer. It sits at least an inch away from the outside edge, so you would need to pull that part of the sleeve around the iPad. You could make it work, but the material isn’t really designed to hold more than a few documents, so it may not hold up well to that kind of weight or bulk long term.

Brand	Cocoon
Product Dimensions	0.97 x 24.38 x 38.43 cm; 349 g
Item model number	CPG20BK
Manufacturer	Coconut Dream
Color	Black
Standing screen display size	39 Centimeters
Are Batteries Included	No
Lithium Battery Weight	694.5 g
Item Weight	349 g

Cocoon

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