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My backpack purse opens on the side that lays against your back when wearing it, making this organizer not the best for this style backpack. Top opening backpacks would be ideal. With that said, it has a lot of pockets for organization but I wasn't able to use the front pockets for eyeglass cases or such. They would have dug into my back when wearing it. It is stiff which in my mind makes it durable. But I actually felt it was a little to stiff, it doesn't give easily when you need it to move a little to find something. It did add noticeable weigh as well without adding anything that I was already carrying. Overall I'd recommend it if your backpack opens from the top. If not you may want to think before ordering.
I recently made a denim backpack for a fun DIY project and it turned into my favorite bag to use for everyday. Problem was that the bag was flimsy on its own. This insert solved the problem in an instant (I bought the larger size.) Everything I take is organized and protected. The insert also maintains the seams on the inside to prevent any future holes from forming. Definitely recommend though if you need something to keep your bag organized.