Hi Julie,
I disagree with what you were told. Think like your ideal customer. Sounds like you may be your ideal customer if what's on your home page is correct. So what type of headline would grab your attention???
Then the other thing is you need to do some KW research. I don't know much about this type of purse, but based on a couple key phrases I see on your site here is what I would do.
I went to SEObook keyword tool
Seo Book Keyword Suggestion Tool
You want to plug in one or 2 or your main keywords. I plugged in pain purse = 0.
Then tried pain handbag - came up with "how to select a handbag if you have back pain."
Only had a few searches but that would be the PERFECT title for an article.
Some other KW or descriptions of the purse you have on your site are:
ergonomic shoulder bag, backpack purse, healthy back bag. So research those KW and then write a separate an article on each phrase. Also research and/or write on synonyms IE: ergonomic shoulder bag, ergonomic purse, ergonomic backback.
Then go through the merchants page and read the description and comments to see if there are any other good phrases. Go to other sites that carry a similar purse and see if you can find more phrases.
Next think about what type of person would buy this bag. What type of problems do they have? What would they be interested in? WHO are they? Women with back problems, right? So write some articles about women with back pain, various back pain solutions. But then also add if you're like me and a regular purse kills your back, this new style I found may help. Worked for me!
I just sorta rambled out some ideas, but you get the pic?