I don't know what you're all on about, i never get any of these bags through the post. Sometimes we get free pens in the post from charities along with an apology for sending it.
I take my snap to work in an orange carrier bag which i got when i bought my last tub of electrolyte from the tri shop. The good thing about plastic carriers is that they're not made of paper, but this unfortunately means they have that cheap plasticy feel a bit like the inside of a Kia Sedona or a Daewoo Nubira. Some plastics are biodegradable but we should be careful not to reuse too many plastic bags in case they spontaneously biodegrade and you lose a bagful of fresh conkers all over the floor. I always look out for carriers which have reinforced handles as this means i can fill them with more conkers initially, or carry more sandwiches to work. Reinforcing of certain areas of a carrier bag should be looked upon as a value added exercise by retailers as customers will come more often in order to raise the mean standard of their carrier bag hoard. I don't like supermarkets who are tight with carrier bags and make you ask for them before issuing you with one only, they should respect the needs of customers especially in conker season.

