Binoculars that fit in your (cycling jersey) pockets!
As an avid cyclist, I usually carry binoculars in many ways. Inside the pannier (this is probably the most common); when I'm carrying a handlebar bag (an Ortlieb Ultimate), the binoculars go inside the bag; other times, if I'm carrying a lightweight binocular, like the Nikon Travelite 8x25, or even the Opticron Traveller 8x32, I carry a case on my belt, so they're always there if needed (I tend to do this on the way back from carrying my daughter to school every morning, and so a I linger on the way back home, usually stopping several times to check what's on, especially in migration season); and then sometimes I carry a binocular case "bandolier style" (the Swarovski from the EL x32/x42 that I use to carry the Canon 12x36 ISIII), but only for short trips. And then, I sometimes take the road bike in order to put on some miles, but if this happens during an interesting period of the year (like right now), then I try to pack something for that odd opportunity that always comes unexpected.
While trying 8x20's, I could test that the Swarovski Habicht could fit on a "tool bottle"...
... this was nice. However, the double hinge, small eyecup design didn't do it for me in the end. Now I'm happy to report that the Vixen @Six 6x18 are a great road cycling companion, they fit inside the back pockets of a cycling jersey
I don't like large smartphones (which is basically every other smartphone nowadays) and I try to find compact models (this is becoming harder and harder). So for me, the ideal smartphone is no larger than 6 inches and a weight of around 150 g (5,29 oz). My partner has a 6,6" smartphone that weights more than 190 g (6,7 oz)... which for me is unbearable. No wonder when you carry the Vixen (145 g - 5,11 oz) on your pocket (even while cycling on your jersey) you basically forget it's there, it's so light and small, just like with a very light and small smartphone

To avoid any problem with perspiration and sweat, I carry it conveniently sealed in a ziplock bag. Today I had to stop my bike to admire the majestic soaring flight of a booted eagle that seemed to really enjoy the patch of land I was crossing. Glad I had some binoculars with me.
(I wonder if Vixen could get a contract for a special Tour de France edition of the @Six... I wouldn't mind one with the red polka dot design

)