It's cheaper and you get more product in a pump sprayer. Avoid products in excessive packaging. It costs more upfront and you have the additional cost of disposal of all that packaging. Take your own shopping bag when you go to the store. If you need a bag, ask for a recyclable one.
Plastic bags are recyclable and they are reusable.
Use them for trashcan liners instead of buying trashcan bags. The handles can be tied together. Save paper that's been used on only one side. The other side can be used for notes or drafts. Share magazines with family and friends.