Sherpani's guide tells travellers to aim for 16 x 10 x 8 inches and lists limits from 15.7 x 11.8 x 7.9 (Ryanair) to 17.7 x 14.2 x 7.9 (easyJet), then marks every bag "Fits under most airline seats: Yes". The Boston AT is labelled "Airline Personal Item" at 18" x 14" x 8.5", larger than every limit in those tables. The Jaunt is labelled "Airline Carry-On" on its own page but is sold in the Personal items collection and called under-seat in the guide. The Airline Approved FAQ quotes a third size (17-18 x 12-14 x 8), and the Solstice is listed as 11.5 feet tall. A shopper comparing numbers sees the contradiction; one who trusts the label may be stopped at the gate.
First action
Fix the Boston and Jaunt labels and the Solstice typo today, then measure the ten bestselling families.
How to measure it
Product page conversion, personal-item collection
- Now
- –
- Target
- +10%
- By
- 90 days
Steps
List the sizes
Every bag family's stated dimensions and size label from the product pages.
Ecommerce Manager 1 day
Measure packed
Measure each family packed full; record the depth that matters under a seat.
Product Developer 3 days
Collect limits
Use the guide's Canadian and European tables and add US carriers from each airline's own page, with the date checked.
Content Writer 2 days
Fix the labels
Boston re-labelled, Jaunt moved to Carry-ons, Solstice typo, FAQ and guide aligned.
Ecommerce Manager 1 day
Build the block
A product-page section driven by a metafield per family.
Shopify Developer (contract) 1 week
Add to the guide
The full table in the guide the airline link points to.
Content Writer 2 days
Train support
Gorgias macro with the same table for "will it fit" questions.
Customer Experience Lead 1 day
Measure
Conversion, returns tagged "size" and fit questions before and after.
Ecommerce Manager monthly
Why it works
Build one fit table from the measured size of each bag family (packed and empty) against the airline limits Sherpani already publishes, plus US carriers checked on each airline's own page and dated. Show it on every product page as "Fits under the seat on: ..." and "Check as carry-on on: ...". Re-label the Boston as a weekender that fits as a personal item only where the numbers allow, move the Jaunt to Carry-ons, fix the Solstice typo, and make the FAQ and guide use the same numbers. Add the table to the guide so "CHECK YOUR AIRLINE HERE" lands on an answer.
Fit is the main buying question for a personal-item bag, and Sherpani's promise is "no-guess travel". Exact, consistent answers remove the reason to leave and compare, cut "didn't fit" returns and reviews, and give Google and AI assistants a clear answer to "which bag fits under the seat on [airline]".
Ready to use
CopyFit table starter (from Sherpani's own numbers)
Bag | Stated size | Label today | Fits 16 x 10 x 8 guide? Soleil AT | 11 x 15 x 5.5 in | Personal item | Check height (15 in) Esprit / Esprit AT | 11 x 18 x 5 in | Personal item | Check height (18 in) Jetsetter Tote | 14.75 x 14.5 x 4 in | Personal item | Check width Wayfarer | 9.5 x 14.5 x 3 in | Personal item | Close Boston AT | 18 x 14 x 8.5 in | Personal item | No: larger than every limit listed Jaunt Garment Duffle | 17.5 x 12.5 x 10 in | Carry-on (in Personal items collection) | No Solstice | 11.5' x 18 x 6.5 (typo) | Personal item | Fix typo, then check
Risks and how to handle them
Airlines change limits
Show the date checked and review the table every quarter.
Honest labels exclude some bags from "personal item"
Sell those as weekenders or carry-ons; a trusted label sells more of the bags that do fit.
Evidence
- Your websiteBlog guide "The Best Personal Item Travel Bags That Fit Under Your Seat" (May 20, 2026; the page's "CHECK YOUR AIRLINE HERE" link points to it): "If you want one bag that works on almost every airline, especially budget airlines, aim for: 16 x 10 x 8 inches or smaller"; tables list Air Canada 17 x 13 x 6 in, WestJet 16 x 13 x 6 in, Ryanair 15.7 x 11.8 x 7.9 in, easyJet 17.7 x 14.2 x 7.9 in, Wizz Air and Vueling 15.7 x 11.8 x 7.8 in; there is no table for US airlines. It then marks every bag "Fits under most airline seats: Yes", including the Jaunt Garment Duffle ("Size: Airline Carry-On", 17.5" x 12.5" x 10", 34L) and the Boston Weekender (18" x 14" x 8.5", 22L).Source
- Your websiteProduct pages (checked October 20, 2026) state size and dimensions in a "Size + Features" block: Boston AT "Size: Airline Personal Item, Dimensions: 18" x 14" x 8.5""; Jaunt Garment Duffle "Size: Airline Carry-On, 17.5" X 12.5" X 10"", yet it is one of the 59 products in the "Personal items" collection; Solstice backpack "11.5' x 18'' x 6.5''" (a single quote, which reads as feet); Soleil AT 11" x 15" x 5.5"; Esprit 11" x 18" x 5"; Jetsetter Tote 14.75" x 14.5" x 4"; Wayfarer 9.5" x 14.5" x 3". No page says which airlines a bag fits.Source
- Your websiteAirline Approved page: "No-Guess Travel"; its FAQ says "Most airlines require under-seat bags to be around 17-18" L x 12-14" W x 8" D" (the linked guide says aim for 16 x 10 x 8); "Every Sherpani bag is built to fit — so you never have to guess, measure, or gate-check again"; a featured read promises "We measured the seats so you don't have to."Source