Joined: Jan 2009
Posts: 44,306
Likes: 6,564
From: New York, NY, and High Falls, NY, USA
Bikes: 1962 Rudge Sports, 1971 Raleigh Super Course, 1971 Raleigh Pro Track, 1974 Raleigh International, 1975 Viscount Fixie, 1982 McLean, 1996 Lemond (Ti), 2002 Burley Zydeco tandem
1/8" chains don't break on the road, as a rule. Derailleur (3/32") chains didn't, either, until we got 8-speed and above chains, because they're made with tighter tolerances. I believe a major factor causing breakage on the road is improper installation.
I don't carry chain tools for two-day trips. The risk just doesn't justify it.