I just ordered the DMSO. I've been concerned about storing this product in its plastic container, since it's a solvent and might pick up some of the plastic. I transferred my last batch to a glass jar. Do you think there's any basis for concern?
The very special type of plastic used for the last 40 years by Jacob Labs as the primary container to store and deliver their various DMSO products is a laboratory grade of polyethylene; this is not your garden variety plastic. As you correctly point out, DMSO will leach and transport many polymers and chemical elements if it is kept in the wrong kind of plastic container. This is a subject I covered with the Jacob Lab people over 10 years ago when we first started to work together to develop a Peyronies treatment protocol. Dr. Stanley Jacobs is a medical doctor, as well as a teaching and research professor at Washington State University, and he gave me his complete assurance that this more costly container is completely safe to transport and store DMSO.
Personally, I would be more worried about the DMSO picking up the residue of what used to be in your glass jar (mayonnaise, spices, even the soap you washed the jar with, etc.) and getting into your tissue, than anything from the original polyethylene container the DMSO comes in.