Here is a break down of the pros and cons of each.

Plastic
Pros: Light
Budget friendly
Lighter
Does not easily break
Cons: Will wrinkle after extended usage
Have to be replaced every couple month

Glass
Pros: Sanitational
Enviromental friendly
Fancier?
Cons: Heavy
Easy to break
Pricey
Hazardous (glass)

Some say that if you use the glass bottles, you dont really get that wierd taste from PET plastic bottles...chemical-like.......?

Interesting comment..never thought about the plastic taste or smell. Maybe its cause there is already over a lb of sugar and tons of aritifical flavoring inside to even notice the plastic taste! haha

I used plastic when I was first in business, 15 years ago. The plastic ended up looking terrible with time and I switched to glass. It is heavier, for sure, but looks so much nicer. The only thing that you need to do with glass is to replace the lable occassionally. I carry several 100 prefilled glass bottles to big shows in the black "milk crates" which I have found the be the best thing to use for transporting.

^^^
I like glass bottles too since it gives the syrup a "classier" look and I heard it does taste better. Sort of like beer, it taste better out of glass than from the can. Maybe we can look into carrying glass bottles once again since not much places sell those these days.

If only you can have bottles that look like glass but are not real glass. That why they won't break if you drop them.

Even though I like to use recycled materials, I do prefer to use glass pouring bottles. The glass can be reused and I find that it helps to cut down on the bees attention. Normally in the summertime we have a hard time with bees trying to get into the syrup.

I only use glass bottles and would never use plastic. I have read a study on plastic water bottles and toxins. Assuming the plastic pour bottles are the same chemical makeup as water bottles, please take note: The study indicates that toxins are emitted from the water bottles if they are reused. For instance if you used the same water bottle for a several weeks by refilling it you will be drinking some toxins emitted from the plastic. Just something I read from a credible source but have not researched this topic much. I just glass.

Mr. Freeze--just happens I know a bit about the toxin-leaching plastic thing. It actually depends on the type of plastic used. PET bottles don't leach toxins. The biggest concern about re-using, say, a plastic water bottle from a vending machine or grocery is that bacteria can build up as the plastic breaks down. That little triangle you see on the bottom of plastic bottles tells you basically the grade being used. Single-use vending bottles are a "1" and break down quickly ("the better to recycle with, my dear"

You can buy heavier-grade, food-safe PET bottles that look like glass bottles, but I imagine they'd be harder to sanitize than glass. Also not sure about the cost.

XSquid is correct, PET bottles has been used in the food industry for quite some time. Although, it is bad for your health if you are to re-use them many times.