need hiking day pack that fits underneath airplane seat

Can you give us an upper spending limit?

You need to charge your lipstick?

But seriously, have you considered adding a hip pack? That would fit inside of any carry on pack in an airplane, and add extra space–a surprising amount!–for your hiking. Plus the darn things are convenient.  If you turn one around and wear it up front, it carries necessities great and keeps you from having to take off your pack for, say, a map or a snack. , or sunglasses. or:

lunch and water
a very small first aid kit and sunscreen (wishful thinking)
phone and lipstick charger
headlamp, just in case
small purse for money and cards

Price – prefer to keep it under $200. Unless the perfect one exists at a higher price! Like, truly perfect.

I think it would be annoying to have two hipbelts strapped around me. And having to have two things when one should do.

I have found some great packs at the thrift store. We might have really good thrift stores here, but recently I found a nice turquoise REI day pack there for $6.

“I think it would be annoying to have two hipbelts strapped around me. And having to have two things when one should do.”

Understood. I thought the same. It’s nice to have your phone right in front, and other things as well. I hate carrying my phone in my front pocket, but others have no issue with that. Best wishes,  sounds like a great trip!

AONIJIE 30L off Amazon for $80 or Osprey has a new running vest straps pack out Talon Velocity 30L $200. Both will probably fit under the airline seat.

I use an Aonijie 30L around town. If you run the numbers, the main compartment comes in at 20L and I think the rest is in external pockets. I like the pack a lot, but I think the strap setup is scaled for Asian dimensions. I’m 175#, 5″9″ and the “vest” doesn’t quite vest it for me, but it’s still very comfortable. Looking at your list, I think everything would fit, though. If you’re less meaty than I am, it might be an excellent choice.

I often carry a Eddie Bauer cirrus light down jacket of a fleece, and a light wind jacket in it, with my lunch, a water bottle, laptop, some first aid stuff, chargers, etc. It hugs my back really well without the belt so that the load isn’t really on my shoulders, making it the most comfy day pack I’ve ever had. And from Amazon it’s returnable.

. deuter Speed Lite 25 . has hip belt with pockets unlike the AONIJIE 30L which is as you say a “flimsy bit of strap.” the Deuter at amazon is $84.95 right now and $120 at Speed Lite at REI . I have never used one so I can’t give you first hand info.

+1 on adding a waist pack. It’s a versatile option.

Or maybe find a narrow roll-top pack that you can roll down far enough to fit under the seat.

My usual hiking partner and I did an overnighter in HI when we had overlapping family vacations. I used a little daypack with a waist pack and he brought is usual frameless roll-top and just rolled it way down for the flight.

I liked that the daypack waist belt didn’t get hung up under the plane seat, in the car and everywhere else I used it on the trip, but my partner’s pack did much better on the hike.

Check out Wapta 30

Timely discussion at SectionHiker.  Sounds like you could have been one of the commenters.  https://sectionhiker.com/sectionhiker-gear-guide/10-best-hiking-daypacks/#comment-199944

Yes, checking every possibility. Looks like a friend may be able to stitch a chest strap onto my old Osprey. The hip belt pockets are still an issue, and the foam backing is disintegrating, but it may be the best option to just stick with the one I’ve got! I haven’t really found anything that someone actually knows will fit under an airline seat, which is essential.

It doesn’t seem that you have that much to carry and a hip belt strikes me as overkill. I have been using a Zack’s Sub Nero 30L for my day hikes and it is perfect for carrying food, water and extra layers etc…

Zpacks Sub Nero 30 L. $225.  You can also add hipbelt with 1 or 2 pockets.  The pockets are pretty nice use them on my Nero pack and I can use them on  my sub Nero if needed..

The pack is awesome and @ 30l it swallow great.

Hmmm, that Zpacks bag looks pretty decent, although a bit pricy. Without any frame, it should squish under an airline seat without too much protest from flight attendants. I would need to add a hip belt; this aging body needs all the support it can get!

The Zpacks website states that the Bagger Ultra 25L Backpack “Fits nicely under airplane seats when used as a carry-on.”

Hi AK, it looks like each airline has different dimensions for under seat storage that vary by several inches–from 14″ long to 18.5″ long, similar variations for other dimensions). I found this chart.  (It’s from a suitcase manufacturer that I am unfamiliar with and it doesn’t have the date when it was written). It may be worth it to check with the airlines and find out the exact dimensions for the planes for your flights.

I agree that sticking with a pack you know you’re comfortable with, and that works for you and that you’ve stowed under a plane seat before, may be the best option, especially if your trip is imminent.

Yeah, I need a good hip belt. Rain gear and all the rest starts to add up.

I know AK Granola doesn’t want a waist pack, but still, I use the Gossamer Gear Bumster at 3.5 ounces. It would fit inside any pack you carried on, as mentioned, in case you end up needing the extra bit. I’m not trying to mansplain or convince! I hope  you find a single pack to work for you.

https://www.gossamergear.com/products/bumster?variant=32941382172726&currency=USD&utm_medium=product_sync&utm_source=google&utm_content=sag_organic&utm_campaign=sag_organic&utm_campaign=gs-2022-05-

Just thinking in a slightly different direction here, but if you don’t completely fill your Gregory 33 for the flight, maybe you can just roll up (or fold over) the top part and stuff it under the seat. I don’t have firsthand experience with it, but I assume it’s not structured.

I recently acquired a 30 l SMD Wy’east pack and just flew to Utah with it partially filled and stuffed under the seat in front of me. As long as a pack of about that size is not filled to capacity, I think many options could work for you. Find something you like and you can make it work. Unless you are flying Frontier, it seems rare for airline staff to inspect a bag that is in the ballpark of a reasonable size.
I really liked the Wy’east with the added Wingbelt that has pockets but minimal padding. The pockets felt a bit bulky at first but I got used to them. Sticker shock is a reality… there are plenty of sites for used/ resold gear if you have the time to hunt and gather.

Maybe not available in time for your trip, but the Six Moons ADC 35L seems like an interesting travel option.
https://www.sixmoondesigns.com/pages/adventure-trekking?avad=223489_d38a6add1

Chase Reeves review of the 45L:

I’ve noticed on most transatlantic flights that the window seat has narrower underseat storage, very uncomfortable even for just my size 14s.   Improve your odds and maybe avoid those.

Gossamer Gear Kumo fits all your criteria. A Kumo replaced a Gregory Zulu 30. Zulu was a nice pack but the Kumo is more versatile. I will never have a pack without waistbelt pockets!,

That Kumo looks really nice! But why do they make the mesh pocket slanted? Seems like a waste of usable space. I really like the features of the Gossamer Gear packs in general.