This is totally non-road trip, but could you put an actual sock over your diffuser to help reduce frizz and heat damage?
Originally Posted by beeduh
If you are taking a plane (if not, just store this tidbit), tape all your bottles shut. The pressure change tends to make stuff want to squirt out. I'd be careful with socks, some of the elastic or synthetic materials could melt if too near the heat element of a blow dryer on anything but "low."