While Japanese government is keen to promote its green policies, the country does go through a lot of shopping bags. If you buy boxes of sweets as souvenirs, generally the company will ask how many bags you would like, enabling you to deliver the goods to multiple individuals still bagged. Order a set meal to go, or even just a coffee to go, at a fast food restaurant, and you might find yourself with a bag containing another bag which holds your beverage. Purchase a single item at a convenience store, and you will be offered a bag. Some people collect brand-name bags for reuse as posh purses.
One exception to this bag-centric culture is tape. Japanese stores use tape to seal the bag, either by binding the handles or taping the top of the bag shut. While the tape does help prevent the bag from reopening, it also serves as a useful proof of purchase.