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When we get refill goods from refill packs into a liquid laundry detergent bottle and try to roll refill packs to force it out completely by our fingers, it is difficult for us to aim the mouth of refill packs to that of refill bottles. To solve that problem, we redesign a normal liquid laundry detergent bottles with a slot at the top of the mouth of the bottles. Just simply slide the mouth of the refill pack in the slot, and the slot can hold the mouth of the refill pack easily. As a result, the refill goods may not be spread out over the ground. This design also can induce people to reuse this plastic bottle.
National Cheng Kung University