Camera backpack

My wife got me this for Christmas and I really like it: (Zecti Camera Backpack)

www.amazon.com/dp/B07B5Y53LX/?coliid=IZ0V1RT6HO4GX&colid=3VSOK1KP1CLI9&psc=1&ref_=lv_ov_lig_dp_it

The separator between upper and lower compartments can be opened.
The lower camera compartment comes completely out as a self-contained draw-string bag.
It is supposed to be pretty much weather-proof as-is, but also has a separate water-proof slip-on cover.(I have not yet tested it's weather-proof abilities - not that we haven't had continuous monsoon weather for months. I guess I should put a couple rolls of tissue in it and hang it outside on a post for a rainy day and see how things fare.)
I currently have a second DSLR with attached lens and a few necessities in the bottom compartment; I stash snacks and lunch in the top compartment.
The plan is, if I get caught in the rain, to remove the contents of the top compartment and carry them in a separate bag and put my main DSLR and lens in the top compartment until the storm passes.
For years, I have stuffed a few Walmart bags in my pockets and have often ended up carrying my camera open-side-down in them to protect it from the rain; this nice Zecti should prove to be an improvement on that plan.
It may or may not be what you have in mind, but I sure like mine.

I clicked on your link and my security program blocks me from seeing it, something about ad tracking or somesuch.

bnk1953
Good camera backpacks are a problem. I've been using this for years:
www.bhphotovideo.com/c/product/577390-REG/Lowepro_LP35269_PEU_SlingShot_350_AW_Sling.html
It has some great features. It can be rotated on the shoulder and you have immediate access to cameras without having to take the backpack off. Very good. It is large and comes with a built-in rain jacket. It is very well padded and lenses are camera are well protected. However, there are some issues with it. 
1) It is no longer available. 
2) It was great for hiking (say) with a 300-mm lens, however, if I put three lenses, including a 400-mm, lens then the strain on the one carrying shoulder became a problem on a long trek. The weight is carried by one shoulder vs two.
3) Last year, I purchased a 200-600-mm lens and it simply will not fit in this bag when attached to a camera.  

So when hiking now I've reverted to an older padded two-strap backpack. It carries the long lens well and weight is distributed over two shoulders. Far from ideal (not enough padding) and it's a pain when I want to get the camera out. I am looking for something better. 

Good luck. Let us know. 
Thanks
Clive

Yup! 

Choosing a camera bag is not as easy as it might seem at first. There are many different things to consider when choosing a bag. I needed a bag that would hold all my belongings and one that would allow me to access certain pieces of equipment. After weighing all the criteria when choosing, I chose a leather camera bag here leather-toolkits.com/reviews/best-leather-camera-bags/ The camera bag turned out to be very roomy and sturdy enough to fit all my gear.

I upgraded to the LowePro Flipside400 awii through B&H. It takes all my mirrorless lens and camera.
I am small so the slingshots just sling off my shoulder. The Flipside is like a regular backpack, complete with built in rain cover. With all the lens and camera it is a little on the heavy side, but I use it to build up my shoulder and leg muscles so I can hit the golf ball further.

I too just got a LowePro Flipside 400 AW-II and I see what you mean about weight when fully loaded. It does hold my Fuji mirrorless and 5 lenses including the 100-400mm plus spare batteries an iPad and a laptop but having loaded it to see if they'd all fit I am going to have to start unloading to be able to carry it!

Tony