When my dd was that age, she lived inside her hotsling. I continued using it for most of my errands through about 9 months, when I switched to the Ergo. We had a ring sling too and I hated it. the hotsling just fit better- both for me and for her. Also, I received a basic mei tai when she was about 3-4 months, and I used that for longer walks and such, until the 9 month switch to the Ergo.
The thing that makes the hotsling (and others like it) so great is that it's just a small piece of fabric, with no buckles, ties, etc. It's easy to transport, easy to slip baby in and out, and then, if you're in the middle of a store and you need to take baby out for some reason, you're not left lugging around a huge bulky thing.