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Mooshroomey posted on r/japantraveltips6d
If you’re willing to check a bag for your return trip, you can get a cheaper duffle bag while in japan, pack clothes/durable/less valuable stuff into it and check it, and pack souvenirs/delicates/valuables into your carry on. Another alternative is to bring one of those hand roll “vacuum pack” bags with you to compress by rolling up your clothes and pushing out air to make a little more space for your souvenirs.