So my usual routine during the week is to come home from work, grab a few handfuls of trail mix and ride my hybrid ~ 15 miles. I just started this a few weeks ago and really enjoy it but I have been building up my endurance and would like to go further, but I'm running out of daylight. I don't really want to use lights as the roads I ride are pretty busy.

I have a weight vest that can go from 5-40 lbs and I was thinking of wearing it to maximize my workout instead of riding longer. Has anybody tried this and if so what did you think? Kinda worried that I might screw up my back or something. TIA.