I love to take Jaden and Jewelina out in carriers! Here's some pictures of them in their various carriers...some they have their heads sticking out and others they are completely enclosed. It's up to you whether or not you want to keep them enclosed in the bag. Some dogs prefer it, others don't like it. I find they draw less attention when they are completely enclosed in their bags when we're in stores. I normally open the carriers and let them pop their heads out when we are outside though!
Here's Jaden in two different bags, one from Tinkerbellscloset and one from TrixieandPeanut.