>>4167349I got this cheap one from Neewer for $70. They've gone up in price since then, but they're quite good for traveling, especially when going abroad. They're also good for storing your gear. The wheels are a bit tricky to replace, but I've found that inline skate wheel work.
But for casual every day shoots, I usually just stuff my camera into my regular backpack, resting softly on a hoodie or something. I typically only bring one zoom lens with me anyway.