Purchased this on Mercari in December 2025. I only tried it once at home, but it was too tight for my 12kg child who moves around a lot, so I'm selling it while it's still in good condition. I only put my child in it once at home to try it out. Since it was listed as "like new" when I purchased it, I am listing it as "like new" as well. The double shoulder strap has not been opened since it arrived from the previous seller. There are no noticeable scratches or stains. 【Retail Price】 Double Shoulder: ¥6,600 POLBAN ADVANCE: ¥11,000 Set Price: ¥17,600 I'll include the previous seller's description below: -------------------------- POLBAN ADVANCE POLBAN ADVANCE Hip Seat Double Shoulder Set of 2 The hip seat box and instruction manual are included, but the shoulder strap is just the item itself. Purchased around July 2024, used 2-3 times a month until around April 2025. Please let me know if you would like to see more photos! I have inspected it myself and there are no noticeable scratches, but please refrain from purchasing if you are sensitive to minor imperfections, as it has been stored by a private individual. Anonymous shipping. Color: Ripstop Black Weight: 456g Recommended Weight: 6kg - 15kg Body Size: 21.5cm x 22cm Waist Size: 62cm - 105cm ・Easy to put on, so moms and dads can easily share it! ・Easy to hold, so it's great when your child starts walking and wanting to be held repeatedly. ・Special design prevents the child from slipping, providing stable support. ・The popular No. 1 model of the hip seat "POLBAN". ・You can add a single shoulder or double shoulder later, meeting various needs. POLBAN ADVANCE Hip Seat, Baby Carrier, Ripstop Black Popular Model: POLBAN ADVANCE (POLBAN ADVANCE)