While waiting for my Synapse 19, I day-dreamed of using it as my one-bag luggage for a trip this summer, with the Side kick tucked inside when moving around and taken out on the plane and as my day bag once at destination. The trip is 16 days, with the first week being for work (but I do not need anything too formal, due to my field), and the second week sightseeing with family. It is a trip to Japan (Osaka-Kyoto-Tokyo) which means it will be quite warm, probably always above 25C and possibly reaching 30 C. I made a list while waiting for the famous bag and tried it when the beautiful S19 arrived.
TLDR: It works with what I was planning to bring, but there is no room for anything else. All space is used. No souvenirs, no just-in-case. My take home message is: I'll probably be using my Aeronaut 30, because Japan = nice paper and notebooks, food, etc (Muji!), I cannot think of not bringing back souvenirs.
So here it is:
What the Synapse looks like with all my stuff and the SK inside
Cue the crappy picture taken in low light. I tried to keep stuff close to their designated pocket
I filled the bag with the following:
-Bottom pocket
in a packing cube (A30 aether small, violet on pic, would probably use something smaller/more squishable)
4 pair of no-show merino smartwool socks (+1 wearing)
5 pairs of underwear (+1 wearing)
1 bra (+1 wearing)
Sleep mask
-Main pocket
1-In a packing cube (A30 aether large, carbon on pic)
1 long sleeve (+1 I'm wearing on plane)
3 short sleeve
1 pant (+1 wearing)
1 skirt
Pajama
Also wearing: cardigan or thin jacket (it's 28 C!)
Note: only one pair of shoes, obviously I'm wearing them *
2-Muji "hangable" small toiletry bag (dark blue on pic)
Toothbrush (foldable)
Floss
Hair brush (foldable)
Razor
Q-tips
Ear plugs
Sewing kit
Elastic hair band
3-Side kick bag (sitting on top for retrieval, as others have suggested on this forum)
Kindle
Epipen
Reading glasses
GF snack
Pen
Wallet
Passport
Phone (used as a camera also)
Muji large cotton bag (Bose noise cancelling earbuds in case, Kindle cable, Iphone cable, USB plug)
-left pocket
Clear 331 bag (shampoo in a small muji travel bottle, 100 ml toothpaste, travel size deodorant)
Medication bag (the small stripped muji cotton bag) (Prescription meds, Tylenol, Gaviscon, Tylenol sinus and cold, Reactine, Alcool wipes,Various band aids, Q tips,,Sterile cotton pads, Ricola throat candy)
-right pocket
Plastic cutelry
Foldable grocery bag
Foldable dirty laundry bag
Foldable plastic water bottle (I'm still debating which one to bring?)
-water bottle pocket
Umbrella mini
Sunglasses
-Small front pocket
Kleenex
So one can travel abroad with the synapse 19 even for 2 weeks (there is laundry involved but this will happen even with an Aeronaut 30) but all the souvenirs have to be in your head!
* I was testing if my large shoes (size 11 ) fit in the bottom pocket, they don't. My son was looking at me and asked what are you doing. I said "some people can fit shoes in there, I was testing" He said "why would people want to pack shoes?". It seems we raised him well for carry-on travel.