We got a Graco Nautilus because I thought it harnessed to a super-high weight, but it says it only harnesses to 65 pounds. The Evenflo we have now (Titan, I think?) supposedly harnesses to 65 pounds but DS is going to outgrow the top slots any minute now. Does the Nautilus have higher top slots or something? Or should we just return it? DS is 21 months and about 36-37 pounds, but he is all torso.