Best carry-on backpack

You are answering a consumer research question. Name your top 3 products, in order, with the exact product name and manufacturer. One short reason each. If you are unsure, say so. Do not invent a product that does not exist. Prices are a constraint where stated; if a constrained pick does not exist, say that and give the closest honest alternative. Date your knowledge. This is not a paid placement.

Reply with only a JSON object, no other text: {"knowledgeAsOf":"month and year your knowledge runs to","picks":[{"rank":1,"product":"exact product name","manufacturer":"brand","reason":"one short sentence","caveats":"price or availability doubts, or empty"}]} with ranks 1 to 3.

Question: Best carry-on backpack

{
  "knowledgeAsOf": "June 2024",
  "picks": [
    {
      "rank": 1,
      "product": "Farpoint 40",
      "manufacturer": "Osprey",
      "reason": "Its supportive harness and practical clamshell layout make it the strongest all-around travel choice.",
      "caveats": "Carry-on compliance varies by airline; its harness fit will not suit everyone."
    },
    {
      "rank": 2,
      "product": "Allpa 35L Travel Pack",
      "manufacturer": "Cotopaxi",
      "reason": "Built-in zippered compartments make suitcase-style packing exceptionally easy.",
      "caveats": "Less comfortable than the Farpoint for sustained heavy carrying; check airline size limits."
    },
    {
      "rank": 3,
      "product": "Travel Backpack 45L",
      "manufacturer": "Peak Design",
      "reason": "Versatile access and expandable capacity make it excellent for travelers carrying tech or camera gear.",
      "caveats": "Heavy and expensive; expanded dimensions can exceed carry-on limits, and current pricing is unverified."
    }
  ]
}

{"knowledgeAsOf":"Early 2025 (approximate; my training data may not reflect the latest product revisions)","picks":[{"rank":1,"product":"Aer Travel Pack 3","manufacturer":"Aer","reason":"Well-built, clamshell-opening 35L pack that meets most carry-on size limits and is widely praised by reviewers for organization and durability.","caveats":"Premium price (roughly $200-$250). The Travel Pack 3 Small is a lower-capacity alternative. Check current model and pricing."},{"rank":2,"product":"Osprey Farpoint 40 (Men's) / Fairview 40 (Women's)","manufacturer":"Osprey","reason":"Comfortable suspension, a lifetime warranty (All Mighty Guarantee), and a duffel-like clamshell opening at a mid-range price.","caveats":"At 40L it can exceed the size limits of some budget airlines. Prices are typically about $160-$200. Osprey may have updated or renamed this line, so I'm not certain of the current version."},{"rank":3,"product":"Peak Design Travel Backpack 45L","manufacturer":"Peak Design","reason":"Has expandable/compressible capacity, excellent access and organization, and a weatherproof build, with a 35L-45L adjustable range.","caveats":"Expensive (about $300). At full 45L expansion it may not fit strict carry-on limits. Check airline size rules."}]}