If you're looking for a nice bugout pack, consider the LA Police Gear Operator backpack for $55 on the LAPG site (usually more expensive on Amazon). I have it and think it's incredibly comfortable.

• 47 liters
• Molle compatible
• Two compression straps on each side, with loops on the bottom to attach additional straps
• Lots of pockets for organization
• Heavy, sturdy build
• ** Internal frame**
• ** Very thick shoulder pads**
• ** Sternum strap**
• ** Thick, comfortable waist belt that effectively takes the load off your shoulders**
• Moderately thick back padding

There are a few packs that share largely the same design, so shop around. But I find this to be exceptionally comfortable and versatile, if a bit heavy.