{
  "id": "E10",
  "url": "https://cartforagents.com/guides/travel-product-data",
  "title": "Travel product data: carry-on dimensions, capacity and airline fit",
  "description": "Publish carry-on claims shoppers and agents can check: external dimensions, loaded state, capacity method, and the airline limits you compared against, with dates.",
  "answer": "A carry-on claim is only true against a named airline's limit on a given date, so publish the bag's labelled external dimensions in centimetres and inches, whether they were measured empty or packed and with handles and straps included, its capacity and how you measured it, and the airline limits you actually checked, with the date. In our October 26, 2026 Shopify Catalog snapshot of ten anti-theft backpacks, two descriptions said \"carry-on compliant\" and none named an airline; on its listed dimensions, that bag is within three major airlines' standard carry-on limits but over two of their personal-item limits.",
  "take": "\"Carry-on compliant\" without an airline and a date is a claim nobody can check. Publish the dimensions and the limits you checked against, and let the shopper's agent do the matching.",
  "summary": "A carry-on claim is a comparison with a specific airline limit on a specific date. Publish the numbers behind the comparison and say which limits you checked.",
  "claims": [
    {
      "text": "For the search \"anti theft backpack for city travel\", two descriptions (positions 3 and 10) used the same sentence calling the bag \"carry-on compliant\". Neither sentence named an airline or a size limit. Position 10's description gave a size elsewhere (18.9 x 12.2 x 7.1 in); position 3 gave one only in Shopify-generated metadata (48 x 31 x 18 cm).",
      "source_title": "Cart for Agents: Receipts cited by our guides (Shopify agent-catalog snapshot, Oct 26, 2026)",
      "source_url": "https://cartforagents.com/research/agent-shopping-research#receipts-cited-by-our-guides",
      "source_date": "2026-10-26",
      "method": "observed",
      "limitation": "One search, one unpersonalized snapshot. Quoted from the catalog records, not measured by us."
    },
    {
      "text": "In the same result, two records for what appears to be the same 28-litre backpack disagreed on size. Position 5's generated spec list gave 19.7 x 11.2 x 7.5 in. Position 8's description said \"Height: 11.2 inch Width: 7.5 inch Depth: 2.4lbs\", and its generated spec list turned that into \"Depth 2.4 in\". Both records give the weight as 2.4 lbs.",
      "source_title": "Cart for Agents: Receipts cited by our guides (Shopify agent-catalog snapshot, Oct 26, 2026)",
      "source_url": "https://cartforagents.com/research/agent-shopping-research#receipts-cited-by-our-guides",
      "source_date": "2026-10-26",
      "method": "observed",
      "limitation": "We did not confirm the records are the same variant or check either against the manufacturer. It looks as if a weight became a depth, but we cannot prove it."
    },
    {
      "text": "Across the 10 backpack records, no field named an airline, said \"personal item\" or \"under seat\", said whether dimensions were measured empty or packed, or said how capacity was measured. Capacity in litres appeared in at least one field on 9 of 10. Dimensions appeared on all 10, in the description on 2 and in generated metadata on 10, and only one record (position 8) labelled which number was height, width or depth.",
      "source_title": "Cart for Agents: Travel bag data, How we checked (Shopify Global Catalog snapshot, Oct 26, 2026)",
      "source_url": "https://cartforagents.com/guides/travel-product-data#how-we-checked",
      "source_date": "2026-10-26",
      "method": "observed",
      "limitation": "Counts the title, description, options and generated metadata we received. Product pages, images and manuals may state more."
    },
    {
      "text": "The two 25-litre records agree once units are converted: position 3's generated 48 x 31 x 18 cm equals about 18.9 x 12.2 x 7.1 in, as in position 10's description, and position 3's 1 kg matches position 10's 2.2 lbs.",
      "source_title": "Cart for Agents: Travel bag data, How we checked (Shopify Global Catalog snapshot, Oct 26, 2026)",
      "source_url": "https://cartforagents.com/guides/travel-product-data#how-we-checked",
      "source_date": "2026-10-26",
      "method": "inferred",
      "limitation": "Our unit arithmetic (1 in = 2.54 cm, 1 kg ≈ 2.2 lb). Agreement between two records does not show the figures are correct or which way the axes run."
    },
    {
      "text": "Position 10's Shopify-generated spec list gave dimensions and weights for both a 20 L and a 25 L size in one record, although the record's title and description describe the 25 L bag.",
      "source_title": "Cart for Agents: Travel bag data, How we checked (Shopify Global Catalog snapshot, Oct 26, 2026)",
      "source_url": "https://cartforagents.com/guides/travel-product-data#how-we-checked",
      "source_date": "2026-10-26",
      "method": "observed",
      "limitation": "One record. We cannot see what Shopify generated the list from."
    },
    {
      "text": "The ten backpack results had 10 different product IDs, all sharing one maker: 8 sold by that maker's own store and 2 by a reseller (first-variant seller field).",
      "source_title": "Cart for Agents: Travel bag data, How we checked (Shopify Global Catalog snapshot, Oct 26, 2026)",
      "source_url": "https://cartforagents.com/guides/travel-product-data#how-we-checked",
      "source_date": "2026-10-26",
      "method": "observed",
      "limitation": "One search and one snapshot. Not a measure of the anti-theft backpack market."
    },
    {
      "text": "Air Canada lists maximum standard carry-on dimensions of 23 x 40 x 55 cm (9 x 15.5 x 21.5 in) and personal-item dimensions of 33 x 43 x 16 cm (13 x 17 x 6 in), including wheels and handles. It says Economy Basic fares purchased on or after January 3, 2025 allow only one personal item on some itineraries.",
      "source_title": "Air Canada: Carry-on baggage",
      "source_url": "https://www.aircanada.com/ca/en/aco/home/plan/baggage/carry-on.html",
      "source_date": "2026-10-27",
      "method": "documented",
      "limitation": "Living airline page; the date is our check date. Rules change, and partner-operated flights may follow other rules."
    },
    {
      "text": "United lists a carry-on limit of 9 x 14 x 22 in (23 x 35 x 56 cm) and a personal-item limit of 9 x 10 x 17 in (22 x 25 x 43 cm), measured including handles and wheels, and says customers not in Basic Economy can bring one of each.",
      "source_title": "United Airlines: Carry-on bags",
      "source_url": "https://www.united.com/en/us/fly/baggage/carry-on-bags.html",
      "source_date": "2026-10-27",
      "method": "documented",
      "limitation": "Living airline page; the date is our check date."
    },
    {
      "text": "Delta lists carry-on limits of 22 x 14 x 9 in (56 x 35 x 23 cm) and 45 linear inches (114 cm) combined, including handles and wheels. Its carry-on page describes personal items by example (purse, small backpack, laptop bag) and gives no personal-item dimensions.",
      "source_title": "Delta Air Lines: Carry-on baggage",
      "source_url": "https://www.delta.com/us/en/baggage/carry-on-baggage",
      "source_date": "2026-10-27",
      "method": "documented",
      "limitation": "Living airline page; the date is our check date. Delta Connection and partner flights may differ."
    },
    {
      "text": "On its listed dimensions (48 x 31 x 18 cm, compared largest side to largest limit), the 25-litre bag is within the Air Canada, United and Delta standard carry-on limits checked on October 27, 2026, and over the Air Canada and United personal-item limits on two sides each.",
      "source_title": "Cart for Agents: Travel bag data, worked airline check",
      "source_url": "https://cartforagents.com/guides/travel-product-data#worked-example-the-carry-on-compliant-25-litre-bag",
      "source_date": "2026-10-27",
      "method": "inferred",
      "limitation": "Arithmetic on seller-listed dimensions. We do not know whether they include straps or were measured empty, and we did not put the bag in a sizer."
    },
    {
      "text": "Read at face value, position 8's dimensions (11.2 x 7.5 x 2.4 in, about 28.4 x 19.1 x 6.1 cm) would fall inside the Air Canada and United personal-item limits, while position 5's 19.7 x 11.2 x 7.5 in would not. A box of 11.2 x 7.5 x 2.4 in holds about 3.3 L, far below the 28 L both records state; 19.7 x 11.2 x 7.5 in is about 27.1 L.",
      "source_title": "Cart for Agents: Travel bag data, worked airline check",
      "source_url": "https://cartforagents.com/guides/travel-product-data#a-wrong-depth-can-make-a-bag-look-like-a-personal-item",
      "source_date": "2026-10-27",
      "method": "inferred",
      "limitation": "Arithmetic only. A soft bag is not a box, so box volume is a rough consistency check, not a capacity measurement."
    },
    {
      "text": "Shopify says some Global Catalog response fields, including technical specifications, top features and selling points, are generated or enriched by Shopify, marked Inferred, may vary in accuracy and should be treated as discovery signals, not merchant-authored source text.",
      "source_title": "Shopify: Global Catalog MCP, Inferred response fields",
      "source_url": "https://shopify.dev/docs/agents/catalog/global-catalog",
      "source_date": "2026-10-27",
      "method": "documented",
      "limitation": "Living developer documentation; the date is our check date. It does not say how the fields are generated or how assistants use them."
    },
    {
      "text": "Shopify says Catalog Mapping can source product data stored in custom fields such as metafields and metaobjects.",
      "source_title": "Shopify Help Center: Shopify Catalog and product discovery for agentic storefronts",
      "source_url": "https://help.shopify.com/en/manual/online-sales-channels/agentic-storefronts/products",
      "source_date": "2026-10-27",
      "method": "documented",
      "limitation": "Living help page checked on this date. It does not promise that a mapped field reaches every assistant unchanged."
    },
    {
      "text": "OpenAI says ChatGPT may generate simplified product titles and descriptions and that its feature labels are not guarantees.",
      "source_title": "OpenAI Help Center: Shopping with ChatGPT Search",
      "source_url": "https://help.openai.com/en/articles/11128490-shopping-with-chatgpt-search",
      "source_date": "2026-10-27",
      "method": "documented",
      "limitation": "Living help article checked on this date. It lists inputs and behaviours, not ranking weights."
    }
  ],
  "sources": [
    {
      "title": "Cart for Agents: Receipts cited by our guides",
      "url": "https://cartforagents.com/research/agent-shopping-research#receipts-cited-by-our-guides",
      "accessed": "2026-10-27"
    },
    {
      "title": "Cart for Agents: Travel bag data, How we checked",
      "url": "https://cartforagents.com/guides/travel-product-data#how-we-checked",
      "accessed": "2026-10-27"
    },
    {
      "title": "Air Canada: Carry-on baggage",
      "url": "https://www.aircanada.com/ca/en/aco/home/plan/baggage/carry-on.html",
      "accessed": "2026-10-27"
    },
    {
      "title": "United Airlines: Carry-on bags",
      "url": "https://www.united.com/en/us/fly/baggage/carry-on-bags.html",
      "accessed": "2026-10-27"
    },
    {
      "title": "Delta Air Lines: Carry-on baggage",
      "url": "https://www.delta.com/us/en/baggage/carry-on-baggage",
      "accessed": "2026-10-27"
    },
    {
      "title": "Shopify: Global Catalog MCP",
      "url": "https://shopify.dev/docs/agents/catalog/global-catalog",
      "accessed": "2026-10-27"
    },
    {
      "title": "Shopify Help Center: Shopify Catalog and product discovery for agentic storefronts",
      "url": "https://help.shopify.com/en/manual/online-sales-channels/agentic-storefronts/products",
      "accessed": "2026-10-27"
    },
    {
      "title": "OpenAI Help Center: Shopping with ChatGPT Search",
      "url": "https://help.openai.com/en/articles/11128490-shopping-with-chatgpt-search",
      "accessed": "2026-10-27"
    }
  ],
  "limitations": [
    "The backpack example is one search in one unpersonalized Shopify Global Catalog snapshot taken October 26, 2026, top 10 results, first variant only. It shows what those records said, not how common these patterns are across travel bags.",
    "The airline comparison uses seller-listed dimensions and three airlines' published limits as checked on October 27, 2026. We did not measure any bag or test it in a sizer. Other airlines, fares, aircraft and partner flights have different rules, and airline pages change.",
    "We do not know whether the listed dimensions include straps and handles or were measured empty. A packed soft bag can be larger than its empty measurement.",
    "Shopify Catalog is one source. We cannot see what ChatGPT, Gemini, Copilot or any other assistant shows a shopper.",
    "The fact card is a proposed record format, not a platform requirement, an industry standard or a measured improvement in picks or sales.",
    "Store and brand names from the catalog are withheld; listings are identified by position."
  ],
  "related": [
    "https://cartforagents.com/guides/spec-sold-product-guides",
    "https://cartforagents.com/guides/pet-product-data",
    "https://cartforagents.com/guides/product-specification-template",
    "https://cartforagents.com/research/ai-product-data-unit-normalization",
    "https://cartforagents.com/guides/agent-ready-product-data",
    "https://cartforagents.com/research/agent-shopping-research"
  ],
  "published": "2026-10-27",
  "updated": "2026-10-27",
  "checked": "2026-10-27",
  "kind": "guide"
}