First thing with bags, is the immortal question: "Is my bag too small or am I packing too much?" Most of the time with people and bugout bags, is the tendency to want to pack for every conceivable contigency that they can contrive. "I need to be ready for anything and everything! Zombies! Nukes! Alien Invasions! Oh my!"
There's a whole schpiel below if you want more. But, first that bag. From what research I made, it appears to have good reviews. 600D nylon is a sturdy, middle ground material. It's heavier than some, tougher than a few, and mostly weather resistant. UV has a nasty habit of wrecking synthetic fibers. Hell, it has a nasty habit of wrecking damn near everything. I've never personally used Teton gear, but a few I know have used it for backpacking and it seemed to hold up well in the woods.
The Schpiel:
The most critical requirement of any bag, is "DOES IT FIT ME WELL?" If it's ill-fitted, don't bother. Your everything will hurt, life will suck, and hauling it anywhere will be miserable. Seriously, take the time, and go to a reputable store and get fitted for one. It will save you much headache, heartache and backache. If they are good with their customers, you can tell them: "I have X dollars. I'd like a pack that does Y, and won't murder me."
Ask yourself a few honest questions:
"What is most likely to be the cause for me to need this?"
"What around me is likely to go wrong that I need to go away for a while? A long while? Possibly forever?"
"What do I personally need to ensure my own safety, health and wellness?"
"Is there anyone else I need to assist? Is it me, or do I have friends/family that need my help to get to safety?"
"How do I plan to get to safety? What is my vehicle? What's my route? What are my options in case those aren't going to work?"
"How long is this going to last? A few days? Weeks? Months? Years?"
"What services can I leverage to help myself and those I need to help?"
"Who knows where I am going, and who I'm going with?"
"How can I stay in contact with those I leave behind?"
Those questions, and the answers to them should guide you well. They are not an exhaustive list. You will have other questions.
The answers I came up with myself were actually really mundane. Something wrong with the house I live in. Fire. Broken Pipe that floods everything. Power failure. However, that only applies to me, right now, where I am. What would I need to ensure my personal safety? This depends on the area, and the threats in that area. Do you have any medical issues that need prescribed medication? If so, start considering asking your doctor for a longer supply. Some drugs they can prescribe a few months supply for you. Most, they cannot. Never hurts to ask.
Most of the time, it's not going to be a major widespread disaster. Disasters like that don't often happen without any warning. Earthquakes are an exception. Floods have warning time. Hurricanes have warning time. Tsunamis have warning time. (Not much, usually an hour at most.) Major weather patterns, blizzards and such are blasted across every weather station on the airwaves for days in advance.
External frames are good for lashing things to. Internal frames tend to be more comfortable, and less apt to snag on things. There is a whole internet debate over which is better. The answer I give? Depends on what you're doing.
Appearance: Go with something sensible. Bright colors attract attention. Camo patterns tend to make people associate you with paramilitary groups. Light colors show dirt, and black gets really hot inside. MOLLE is useful for attaching things, but can snag.
Weight and durability often go hand in hand. 15D silnylon weighs next to nothing. It also rips really easy compared to others. Heavy canvas truck tarp is tough stuff. It's waxed cotton, it's the John Wayne of materials. Rough, tough, and doesn't take shit off anyone. A pack made of this would last a very long time. The pack would also weigh 20 pounds empty. So we look for a middle ground. 600D nylon is right about the middle.
The list of requirements is bog-standard for what a person wants out of a hiking backpack. I'd recommend something padded for the camera gear, or just get a cheap cam that takes pictures you can tolerate, but that won't leave you heartbroken if it dies. The trails and roads are not kind to anything with delicate parts. A smartphone in a good case would be a better choice than a laptop. Laptops are bulky, fragile, and attractive to thieves. Smartphones are attractive for theft too, but provide much more in terms of functionality. Foremost, you can let people know what's going on and call for help. US regulations require that any cell phone, regardless of service. If it has signal, it must be able to call 911. Chargers for phones are smaller, lighter, and found just about everywhere. Lose a laptop charger, and depending on what model it is, you might be S.O.L. Paper back books are a great idea. Multiple uses, entertainment while you read them, trading fodder when you're done, and in a pinch, you can use them for hygiene purposes, or to get a fire going.
Recommendations for gear? Want some?
Travelling: Good workboots. Comfortable. Leather. Tough. Slightly heavy but good ankle support. Grippy soles.
Shelter: Depends. I've used a tent for the space and the ability to have all my stuff inside with me. I've also used a bivybag and a tarp.
Tarps are quicker and cheaper. Bivies are easier to manage because they slip over your bag, and when you roll about, don't have the tendency of uncovering part of you in the rain or snow. Tents are nicer when you have to wait out a rainstorm or something and want to do it dry, but are out in the middle of nowhere.
Sleep Gear: Sleeping bag liner, bag, folding foam mattress. The liner is easier to wash and dry, and works as a warm weather bag when it's above 60F. Bag's good for padding if it's warm. Foam doesn't lose its cushion when punctured. Sometimes I just find a nice soft grassy area. Cardboard works in a pinch too.
Water: Sawyer filter, and found bottles. In town, just ask for water. In the woods, filter or boil, sometimes, filter AND boil.
Food: Ziplock gallon bags for saving stuff from wherever. Either what I get by asking, or what I find.
Weapons: Depends. Personally? I use a shoulder height hickory walking stick. It's simple, doesn't need sharpening or jam. When used as a walking stick, you can carry it anywhere. I've never had to check it at a door, or have security personnel question me about it. It's an all-audiences crowd pleaser. Bad dogs know what it means as soon as you raise it and yell. Any that I have encountered were happy to show me what their tail looked like and how fast it could go away. Most bad people will figure out what's about pretty quick too. It's also multi-purpose. Guns often cause more trouble than they're worth. There are also cases where they are THE thing to use in a situation. There are also a lot of situations where having one can land you in a lot more trouble. Knives are good to have too, but more as a last resort. A stick has reach. A knife doesn't. Never throw a knife. If you miss, now they have a knife and you don't.
Lighting: Found anywhere, usually cheap. Try to make sure everything uses the same batteries.
Entertainment: Books. Sometimes phone. Mostly being outside and fishing or bird watching. Working is also surprisingly entertaining if the job you're doing doesn't suck.
Personal Hygiene: The usual. Toothpaste, toothbrush, soap, you get it.
First Aid: Lightweight, really, a few bandaids, and antiseptic stuff. Over-counter stuff for the common problems. Sore throats, stomach bugs, blisters, cuts and scrapes, etc.
Pictures: Smartphone camera. Sure, the camera on every smartphone is crap compared to a professional setup. It's also easier to stuff in a pocket. It's also easier to care for than a camera body and lenses.
As for my pack and me?
I use a Deuter 75+10. (Money was good, and it was on sale for a song) I am a large individual, so everything I wear has more material. Pants are longer. Shirts are longer. Everything is wider. Even folded, that stuff takes space.
I've been travelling on and off since 2010.
I carry more than I should. It's nice having it when I do. I use an alcohol stove, for instance. I like my coffee. I like it hot. Sometimes I'm nowhere near a gas station or place that offers it for free. I like my alcohol stove, because it's dead quiet and with the windscreen, nearly invisible to passers by. Alcohol is mostly everywhere, and in a pinch, the windscreen doubles as a can to burn solids, like sticks, cardboard, pine cones and other junk. High proof liquor works too. I'd rather drink it, but in a pinch, I can warm myself up with a fire.
I am happy with my amount of equipment. It could always be lighter. It could always be smaller. Replacements could always be cheaper. However, when things get lighter, they often get less durable.
I would recommend the size of pack that holds everything you need and some things you want. One that fits your spinal length and shoulder width. One that makes it easier to carry all your worldly possessions. One that will last long enough to satisfy the question of if you get your money's worth out of it.
Conclusion: It's your journey. It's your weight.
With Health and Luck,
Antlered