I buy my PB in plastic jars and leave it in the original container. If I want my PB mixed with jam/jelly/honey/something else, I do it at home, put it back into the original plastic jar and take that. If I want it separate, I put the jam/jelly/honey/whatever into an empty plastic PB bottle and take it that way.

I've used the tubes before but didn't care for them. I found them messy, hard to squeeze (especially in cold weather), a pain to fill, etc.

The plastic PB jars are reasonably light, very durable, reusable, easy to use and can be put to other uses when empty and cleaned out.