One of the things that brothers usually have a problem with during Raksha Bandhan is the gift that they will be giving to their sisters. Giving a photo mug is one good gift. It is likely that the sister will appreciate this greatly. This is actually more recommended to sisters who are already married.
Another possible gift is a personalized postcard that will show that the sister is the best sister ever. A cotton quilt is also another gift that will be appreciated. Sisters can never get enough cotton quilts especially because this can be used so many times. Bowl sets that are personalized or will come with awesome designs will be appreciated too.