Nikon Trailblazer 10x25mm Binoculars - Compact, Waterproof & Fogproof, Bright Multilayer-Coated Optics, Roof Prism - All-Terrain Outdoor Wildlife Viewing & Birdwatching Binoculars (8218)

These are the ones I carry. I have big ones too, but I keep those in the trunk for off roading. I can weigh them if you're interested, but they're the lightest ones I found at the time. I also have a Nocs monocular Zoom Tube, but honestly the Nikon ones are less bulky and have better focusing.