Long story short, if you are looking for a carrier for a baby to toddler, this is by far the best I've used.
This is the second product I ordered. The first one was a different brand with similar looking, but didn't have the large packet under the seat (the seat was solid) and had no shoulder strap. The first one tremendously saved my back and relieved the pain when carrying my baby around. So when it was a little worn and my now toddler still wants to hop on me when going out, I started looking. Knowing what works well as a carrier, I was super excited when seeing this product. The carrier itself frees your hand (one hand, you still need to hug your baby with one hand since there is no bucket to tie the baby on you) and instantly relieves the tension and weight on your back. I can carry my almost 40 pounder to walk for a mile without problems, v.s. without it, I have to put the toddler down to rest my back every couple of blocks.