Article writer for Carrier Bag Blog

We are looking for an article writer to write 5 articles per week for our company blog, each article should be no less than 300 words and have our targeted key words throughout.
Our company supplies printed carrier bags for retail and promotional events so all of the articles will need to be carrier bag related. We will give you our keywords and point you to our competitors websites who are creating lots of articles around the same topic we would then want you to come up with ideas for unique articles relating to carrier bags.
If you are interested in this ongoing role can you please tell me how many hours it would take you to write 5 good quality articles and if you have any examples of similar projects you have worked on this would also be helpful.