(3)Article 77(4) of Regulation (EU) No 1308/2013 provides that products of the hop sector may be marketed or exported only if covered by a certificate issued in accordance with that provision. Breweries pay great attention to the quality of the hops used in the brewing process because that ingredient has a big influence on the taste of the final product. Where hops are grown and processed by breweries or by third parties on contract for a brewery, requiring an official certification in addition to the internal quality control of the brewery concerned would create additional cost and an unnecessary administrative burden. Small quantities of products of the hops sector sold to private individuals in small packages are a niche market and certifying the content of each small package and marking the packages according to the applicable rules would be an unjustifiable amount of work, especially as this would also have an impact on the price of those products for the private users. Isomerised hop products have undergone heavy processing and are of a stable nature, which is why certification is no longer necessary to guarantee their quality. It is therefore appropriate to exempt certain hop products from the certification requirement for marketing or export purposes.