There is not a specific pocket in the Guard Dog Security ProShield Pro Bulletproof Backpack designed for an armored plate. You could theoretically place one inside the back, but there isn't s specific spot for it.
The Guard Dog Security ProShield Pro Bulletproof Backpack is discontinued by the manufacturer. I'd recommend the Leatherback Gear Civilian One Highly Functional Bulletproof Backpack, which has places to hold water bottles, and can be found by using the link below:
https://www.opticsplanet.com/leatherback-gear-civilian-one-backpack.html
The Guard Dog Security ProShield Pro Bulletproof Backpack has been discontinued by the manufacturer. I would recommend the Guard Dog Security ProShield Smart Bulletproof Backpack, which is a 27L pack, found by using the link below:
https://www.opticsplanet.com/guard-dog-security-proshield-smart-backpack.html
The material is primarily cheap Chinese BS that is also used on everything else that’s shipped to the United States you’ve purchased before and regretted it. (;
Possibly where it folds, but nothing extremely significant.
There are built in Level IIIA bulletproof panels in the back panel of the backpack.
This is not waterproof.
There is a pad, its dimensions:11.5 x 16.5 x 0.4 inches
The whole backpack is made in China including the bulletproof panel.
Per Guard Dog, there is a built-in, hidden gun holster compartment that holds and conceals nearly all handguns for the Guard Dog Security ProShield Pro Backpack .