I have been using the heavy plastic Ragu jars, the ones with hand-holds, for awhile now and I've had no problems whatsoever other than the mold that I stupidly allowed to grow in some forgotten Photoflo solution.
I do make sure they are super clean by multi-able washings that include baking soda in the dish detergent and I isolate the chemical from the metal/plastic lid with Saran Wrap. So far fixer, selenium toner solution, etc have done well in this storage.
Because I mix most film developers as needed and store my Ansco 130 and PMK Pyro stock solutions in glass, I feel that reusing these plastic bottles is a safe move.
I have however, noticed on my late night walks with my dog that a neighbors recycling bin has a weekly deposit of extra large, thick wine bottles, several of which are a dark brown. Tonight I'll begin raiding this resource as you never know when you'll want good glass storage.
Cheers