Hi @ElectronEKB - Thanks for reaching out. It's great to hear that your bag treated you so well for many years! It looks like that pack is the Co-op Cambria Flap Daypack and has a capacity of 5 liters.
While none of them are exactly the same size or style, you may want to take a look at these bags, which also have slim designs and smaller capacities:
We have also passed your feedback along to our buyer team. If there are plans to release another bag similar to your Co-op Cambria, we will circle back to this post and let you know! Thanks!