I bought my Celine Belt bag in late 2014 and it still looks brand new. The shape is still perfect. There is no sagging and it’s not misshapen in any way.
That said, it’s not a bag I carry everyday but I do use it about once a month or so. I also look after all my bags (they are like my children!) and stuff them when they are not in use. As for this Belt, I also store it upright and in its dust bag every time.
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Here are pics of my Belt. Still in good shape after 3 years! Wish I could say the same about myself! LOL! It’s a beautiful bag and I still love it as much today as when I first bought it. Hope this helps!