The first thing is to look at what you’re actually carrying. You have the camera, but there’s also the lens. If you only have the kit lens that came with your camera, then you don’t have any other options. But, if you have other lenses, then you’ll need to choose between them. Although they’re bigger and heavier than single focal length prime lenses, zoom lenses are good candidates to win some coveted space in your bag—they’re more versatile and you’ll find it easier to take photos in more situations when using them. If you’re concerned about weight, I recommend you go with the smallest, lightest lens you can, at least in the beginning. Once you’ve gotten into the habit of carrying your camera about, you can make it bigger and heavier.