looking for a good bug out bag, what do you guys use???
I have a few different bags, but it really depends on your use, location and health. Some guys really have small loads and can keep them between 20-30 pounds. A small 3-day pack (~1500-2000 cu in) will work, but I really recommend at least one of those plastic sheet frames. Once you get over 30 pounds, you really need a decent frame of some type to stabilize the load and keep your back and shoulders from taking too much stress.
A waist belt is another consideration...especially one that actually works to shift the weight to your waist and legs.
You really need to determine how long you'll be bugging out...how far if you have a destination? Is it for the vehicle/office at work and be used as a "bug-home-bag"; how far is that? This is the critical part, because you could have a bag weighing 30 pounds or 130! As to carrying weight, make sure you're healthy enough and try and get out and carry your pack once a month (or more). I often recommend people actually take their BOB out for a weekend in the back yard or nearest backpacking/camping area for working out the kinks and figuring out what is really needed or not.
I've have/had several bag set ups:
Cold weather 10+days = Kifaru EMR/Scout combo
I have a couple of different truck bags = Large Becker Patrol Pack and the Snugpak's Rocket pack.
I have a couple of light weight bags that we take for backpacking, and they are always packed. I'm currently using a Gregory Z65 (it's about 4000 cut in) and my wife is using an Osprey Aura which is about the same size.
I have a Kifaru Zulu loaded up for field or traveling (Army) here in the states, and I have an older HSGI-modified Large ALICE ruck for deployments that's usually pre-packed and ready to go.
I use a Kifaru Pointman for hunting and summer time BOB and it's usually loaded up.
My work pack is a small RAID pack with some essentials.
Define what you think you'll need and then look at choosing a pack. I've seen guys as places like REI carry their backpacking loads in garbage bags to find the right size/capacity of backpack. That's a little extreme, but there is something to be said for loading a pack. Many people figure if they have a 7000 cu inch pack, they'll continue adding stuff (most unnecessary) and increasing the weight to where they can't even carry it to the car much less down the road or trail on their back. You want just enough room to expand as you don/doff clothes. A pack that compresses is good so you don't have a half-empty flopping pack on your back.
I don't want to address construction too much, but if you plan to keep it in the car and don't expect much "off-trail" use, most quality brand-name backpacking packs will do fine and be much lighter. However, if you expect to hike cross country, you really need to consider with a more stout and durable construction. I dislike the term "tactical", but there are some excellent (and expensive) brands that are built for deep backcountry/combat zone use...Arc'Teyrx, Kifaru, Mystery Ranch, etc. What you gain in robust construction, you often gain additional weight as well...just something to consider....
Last couple of things to consider is organization and hydration. My HSGI large ALICE pack has several external pouches. It's handy, but makes the pack bulky if you plan to hike around dense foliage. The benefit is quickly accessing necessary items such as FAK, binoculars, rations, shelter, jacket, etc. The opposite end of the spectrum is just the simple tube pack construction found on most internal frames. They are typically lighter and more streamlined, but you have to take care on packing so you can access them without have to fully dump your pack every time.
Hydration is critical as we all know. I like both hydration bladders and bottle pouches. Most packs have their water bladders on the inside and it's a pain to access when you need to refill. I like using the bladders for hydration on the move and use the bottles when I stop to take a break. Also, having a water bottle makes it much easier to purify/filter water and then use the bottle to refill your bladder.
ROCK6