I love my Kershaw Leek. It's legal to carry concealed in my state (3 inches) and is spring assist. It almost a switch blade, but still legal. I've carried it for 8 years. Excellent knife for $50 or less, and sold at Wal Mart.
If your glasses fog up and you want to make your own mask fans, here's how;
"My happiness doesn't depend on anything. My heart is always happy. I do have anger issues though."