The only disadvantage I can see is that a pack that will fit him now may not fit him when he's an adult. Halo's pack (size small) only weighs a pound (if I remember correctly, I weighed it a while ago), so that shouldn't be a problem. She is 58/59 pounds, and Keefer (approx. 80 pounds) wears a medium Approach.
Do you know how big his parents are? Measure his girth and see where hit falls on the size chart. Fortunately, there is quite a bit of overlap between sizes, which makes it easier to guess what size he'll need once he's mature. The small fits 21" to 30" and the medium fits 26" to 36" - I think Halo was around 26" when I bought hers, so she could wear a medium, but was well within the range of a small. Her growth had already slowed down to the point that I felt pretty confident that she wasn't going to get 4" bigger around. Keefer is 33", so he could have worn a large (32" to 48"), but he was already 4 years old and fully grown when I bought his pack and he has a few inches to spare on the medium. The larger sizes have larger bags on them and I don't need that, plus, I'd rather have less slack to deal with on the straps.
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