Marina bag has uncomfortable shoulder straps

Hi, I recently got an Marina bag. I love the bag, but the shoulder straps/handles are surprisingly uncomfortable for a timbuk2 bag. In particular, the lack of padding over the plastic inserts makes it uncomfortable to carry over the shoulder. Is there something that can be done? Maybe you guys can make a velcro strap for this, like a padded strap that slips over each handle? Thanks!
 
sad I’m hurting on my shoulder
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