I have a Kata 3N1-35 PL that im putting up for sale tomorrow. Very nice bags which has a top section for non camera stuff. Comfortable when wearing with plenty of camera protection. Mine will be well under your budget and is in superb condition.
Lowepro are bringing a new flipside range out, I think it's flipside trek or something similar. I caught my eye because of the ability to carry non photography items in the top.
Alternatively a standard hiking rucksack with a camera insert. My rucksack has a side zip to access the bag as well as he usual top opening so if I put the insert in sideways I can get the camera out quickly without having to take stuff out of the bag. Loads of straps and loops on the ouside for a tripod. I also have a Nest camera bag that has a tripod carrier but I don't like using it for the tripod because it puts the tripod a long way from my back and feels a bit unbalanced.
I have a Lowepro ROver AW II from ebay (probably, almost certianly fake as think its been discontined) - it has a fold down pouch thing so you put the feet of the tripod in the bottom bit and then use the cords to secure it. it also had a 'normal stuff' section at the top. Just used it in Iceland - It can be a bit fiddly and the tripod sometimes gets in the way, but it served a purpose.
https://www.amazon.co.uk/Lowepro-Rover-AW-II-Backpack/dp/B0001MIIHO
Carrying a decent size tripod on a backpack is usually awkward. They're tall and protrude quite a long way, catching on things; mounted on the back increases the leverage weight on your shoulders and the backpack will tend to sway left-right more; mounting a tripod on the side can unbalance the backback.
I prefer to carry a tripod separately, on a sling over the shoulder something like this https://www.amazon.co.uk/OP-TECH-Tr...1474899042&sr=1-1&keywords=tripod+carry+strap Or in a tripod bag. Or another method is to hang it across your tummy, hooked up to the backpack harness.
I use one of these https://www.webtogs.com/en-UK/Lowe-Alpine-AirZone-Pro-35:45-Backpack/38321wmp.htm?colour=Black&sku=299561&productid=85799&utm_source=google&utm_medium=cpc&utm_campaign=Shopping API&gclid=CjwKEAjwjqO_BRDribyJpc_mzHgSJABdnsFWvpyz9VjzKILCY8PHB9Y1h_xwpeNWLOqkuzGOpcCNJxoCWRfw_wcB
Tripod is a manfrotto 055, feet stuck in behind the webbing and i added an extra strap at the very top to hold it in close to the bag. The side opens at the bottom, i have a camera bag insert in there that holds a body and 2/3 lenses, lunch and clothes etc go on top and are accessed through the top opening.
Loads of extra pockets and sits nicely off your back to stop sweating, loads of adjustment to make it really comfortable and can be carried all day.
If I may intrude, what type of protection things are available to allow packing in a normal ruck sack?