Hello All. I run an online marketplace start-up that has around 10000 products listed from around 1000+ sellers. We are a similar model to etsy/ebay in the sense that we provide a platform but sellers to list products and sell them. I have a URL structure question. I have read http://www.seomoz.org/q/how-to-define-best-url-structure-for-product-pages which seems to show everyone suggests to use Products: products/category/product-name Categories: products/category as the structure for product pages. Because we are a marketplace (our category structure has multiple tiers sometimes up to 3) our sellers choose a category for products to go in. How we have handled this before is we have used: Products: products/last-tier-category-chosen/product-name (eg: /products/sweets-and-snacks/fluffy-marshmallows) Categories: products/category (eg: /products/sweets-and-snacks) However we have two issues with this: The categories can sometimes change, or users can change them which means the links completely change and undo any link building work built up. The urls can get a bit long and am worried that the most important data (the fluffy marshmallow that reflects in the page title and content) is left till too late in the URL. As a result we plan to change our URL structure (we are going through a rebuild anyhow so losing old links is not an issue here) so that the new structure was: Products: products/product-name(eg: /products/fluffy-marshmallows) Categories: products/category (eg: /products/sweets-and-snacks) My concern about doing this however, and question here, is whether this willnegatively impact the "structure" of pages when google crawls our marketplace.Because "fluffy marshmallows" will no longer technically fit into the url structure of "sweets and snacks". I dont know if this would have a negative impact or not. FYI etsy (one of the largest marketplace models in the world) us the latter approach and do not have categories in product urls, eg: listing/42003836/vintage-french-industrial-inspired-side Any ideas on this? Many thanks!