I have reviewed a few carriers for when the need arises...
Ergobaby Sport Baby Carrier
The "Ergobaby Sport Baby Carrier" is lightweight, pretty easy to load baby into, and can be used "from birth" when the baby is only 7 pounds. This carrier is very comfortable with a little baby facing you while wearing it on the front. When my baby got bigger, I wanted to wear him on the front but facing out and this carrier is not designed to do that. Although this carrier can be used with a child up to 45 pounds, I don't know how to get baby in it when wearing it as a backpack if you're alone. I feel like it was grown out of really fast; especially for the price! Retail price: $115
BABYBJoRN Active Cotton Mix Baby Carrier
First of all, the "active" in the name of this carrier refers to the added lumbar support for the parent. The original BabyBijorn just has a crossed back. This carrier is VERY comfy and supportive. It's easy to get baby in, and you don't feel like baby is flopping around or that you need to keep your hand on him. I loved this carrier in the winter but the extra back support is extra sweaty in summer. I like that baby can face in when they're little and need head support and they can face out when they're older and want to see what's going on during your walk. The biggest downside to this carrier is the price, but maybe you get what you pay for. If I was an avid baby-wearer, the investment would be worth it. Retail price: $130
Fleurville 3-Position Comfort Carrier
This is the carrier I actually decided on for my baby... the price was right! This carrier can be worn on the front with baby facing you or out, and it can be worn back-pack style (those are the "3-positions"). The most disappointing thing about this carrier was how long it took my son to grow into it. I couldn't use it until he was about 3 months old. This is not the manufacturer's fault though, it just took him that long to get to the minimum weight; maybe this is why I didn't turn into the baby carrying type. Anyway, this carrier does its job and works for both my husband and I. The only thing that could be improved upon is its stability. Even when you tighten the shoulder straps, it still feels like baby is leaning way out and "flopping around". I liked it much better when I would wear a coat and zip it up over the carrier. Like the Ergobaby, I have not used this wearing it backpack style because I just don't know how I'd load baby that way. Retail price: $30
Seven Everyday Sling
I acquired this sling from a promo code for a free sling (just pay shipping) which was actually legit. The "Seven Sling" is not adjustable or stretchy so it comes in several sizes. You need to measure yourself to make sure you get the correct size. I like this sling because I can easily fit it into my diaper bag in case I'm in a situation where I need to hold my son for an extended period of time. They also have trendy fabrics, and my husband really likes the fit of this sling! There are three ways to wear this sling but I only had luck with the hip carry position. My son was too big to fit inside the sling even though he was younger and smaller than the suggested hip carry size. This could have been my fault for not getting a big enough size (my chest took up most of the space that was supposed to be for him). This sling is a really simple, easy idea and a great price. The back support is limited. Retail price: $48 (but there are always promo codes)