Originally Posted by
WhyFi
Cool, thanks for the tip - I probably won't be out for more than a few hours at a time, so I'll see if I can get at least a couple rides out of each.
If you're out for a few hours at a time I'll be surprised if you get two completely useful rides out of them, but who knows. I used some of these to help me out while sneaking in a 50 mile ride at like 12:05 AM Christmas Eve Day to get a head start on Strava's Festive 500 challenge one year*. You could be more careful with them than I was as far as limiting the air, but I didn't get two rides in with them before they were used up, even when put in air-poor situations like being duct-taped onto the toes of my cycling shoes.
*getting in a 50-mile ride at midnight on Christmas Eve allowed me to get a large chunk of miles in, then go to sleep, wake up again Christmas Eve morning and ride again, effectively giving me one extra sleep cycle during the 8-day challenge to get help recover from all those miles.