をに置く、を先に広げておくがいます。が始まってから両手でを開けようとすると、財布やスマホを持ちかえる回数が増え、から渡された品をにが重なりやすいからです。
Some people open the mouth of their reusable bag before placing it on the checkout counter. If they try to open the bag with both hands after payment starts, they have to switch their wallet or phone around more often, and their movement can overlap with the moment the clerk hands items over.
とくに小さいやセルフでは、かごからを移したあと、すぐ袋詰めの流れになります。が閉じたままだと、や豆腐のように上に置きたいの順番が乱れやすく、の底も広がりません。引っぱると、持ち手どうしがねじれたままになることもあります。
Especially in small shops or at self-checkout, the flow often moves straight from the basket to bagging. If the bag is still closed, the order of soft items like bread or tofu can get messy, and the bottom of the bag does not spread open well. If someone pulls it in a rush, the handles can stay twisted.
だから、並んでいる間に一度だけと底を軽く広げておくがいます。振るはありません。の前まで来たら、そのが台の上で自立する形かどうかを見れば十分です。の一品を入れるにが戻らなければ、それで十分です。
That is why some people lightly open the mouth and bottom once while they are waiting in line. There is no need to shake it wide. By the time they reach the register, it is enough to see whether the bag can stand open on the counter. If the opening does not collapse when the first item goes in, that is enough.