I do actually have that sleeve for my Framework. It could be a little tighter fitted (there’s about 5 mm space on every side) so it can wobble around a little but I’m okay with that.
That’s for the 15" Surface Book, that would be too large.
Defender-A13 Laptop Sleeve for 13.5-inch Microsoft Surface Laptop (tomtoc.com) this would be the correct size.
… I asked Tomtoc directly to see if they had a better fit, thanks! 
The response from tomtoc.com:
Since the dimensions of this model are the closest one to the framework laptop, we believe the deviation of 5mm is acceptable for you.
Defender-A13 Laptop Sleeve for 13.5-inch Microsoft Surface Laptop
I recently acquired this hard sleeve,
13.3 inch SITHON Hard Shell Laptop Sleeve Case
The dimensions are juuust right, as you can see on the following picture. So far, I am very satisfied.
I ended up ordering this:
So now I have both products to compare. The tomtoc sleeve is a little bit bulkier, but I like it better because of the zippers.
Here are both sleeves next to each other:
And from the side:
The timbuk is a nice sleeve, but it’s strange in some ways; the flap doesn’t completely close so it doesn’t feel as “sealed” as the tomtoc. there’s also clips in the back that feel weird or at least useless to me.
on the other hand the tomtoc is thicker. now i can’t help but think i really need just a one-layer sleeve of some sort. no padding, just some water/scratch-proof thing so i can shove this thing in my bag without worrying about spills…
oh, and now i guess some will wonder what kind of case will fit the 16" too. 
thanks everyone for the advice!
I suspect that’s because your image files are too big. The message composer is a bit coy about saying why it’s rejecting your upload. It rejected several attempts of mine when I was attaching the pictures above. It seems like the file size limit is ~1MB.
Dino
Convert to jpeg or downsize, maybe? I’m interested in the comparison. I got a Tom Bihn 12B and it is too small for me so I returned it.
They are JPEG. Not sure what was going on here, it doesn’t happen anymore and I have uploaded the photos.
Huh, odd. They do look nice though! Which one do you think would work better for most? The Tomtoc seems like it would be
i think it’s a matter of personal preference. the Timbuk2 will work well if you want to carry it around on its own, and it’s thinner. the TomToc is better sealed and feels a little more padded, so i prefer it…
When I have to use a smaller bag to carry my stuff, I use this fairly generic mesh cushion case from when I used to have a 12" MacBook:
My go-to, though, is DIY:
It cost roughly USD$20-30 of materials from the likes of Fabricland (bulk cloth, fabric and sewing supplies), Michael’s (art and craft supplies), and a shop called OOMOMO (home lifestyle goods) during the pandemic, then sewn by hand with a mix of cotton thread, polyester thread, and fishing wire 
. Cushioning material is the sort of cut-to-size polyurethane lining one would use for shelves. Jump rings at the flap are for attaching an aftermarket shoulder strap. Not water resistant.
The whole sleeve barely fits within a backpack that can normally accommodate 16"-18" laptops, not a big deal as the sides and corners can be squished in.
Does the TomToc have room enough in that side picket for the A/C charger, maybe with a little extra space? I have a little external SSD and a small USP pouch I’d also want to carry with it.
sure, yeah, the Framework A/C charger fits there plenty. You will probably be able to fit a small SSD there. I’m not sure what a USP pouch is, so I can’t comment on that.
My side pocket carries the Framework PS, an after-market USB3 cable, an AU power cable (significant only because the wall-end plug is bulkier than its US equivalent), a slim mouse and a zip-lock bag that holds USB sticks, Framework Ethernet card and an LTE dongle.
Too much information I’m sure. 
Dino
This specific one seems a little bulky but it might work.
Well, because of this thread I am joining the timbuk2 utility laptop sleeve camp. I wanted the thinnest+smallest possible backpack to be able to take my laptop and charger with me on the subway without having to take my backpack off. Thanks for all the photos and suggestions!
One thing to note, when you add the backpack to your cart it says “final sale” which idk if that means its on clearance / will be going out of production or if it just means “all sales on discount items are final”.
It looks bigger than it is, it squishes down probably the same size as an external SSD. Honestly the one I have I’s be surprised if I couldn’t jam it almost anywhere, although it might get a little bulky if I throw a couple expansion cards in the little pouch, which is the plan. Guess we’ll have to see. If the TomToc doesn’t seem to have a lot of room for the FW13 to slide around or jiggle much, I think I’ll go for it.
edit:
I went for it. I will update tomorrow how it fits, if it fits with the charger / accessories in the side pocket, etc. It came out to only a bit more than $25 on Amazon with next-day delivery as well.
This is slightly off topic but adding for reference, I’ve since gotten a second Feuerwear Gordon messenger bag in the smaller size (15L) and prefer it for general use. The laptop compartment is pretty minimal fabric and only has enough space to comfortably accommodate the Framework 13 itself, while I haven’t had any issues doing so, if you want to store your Framework 13 in a separate sleeve for some added protection, the larger Gordon 18L is likely preferable for the added space.
Photos for reference with the laptop by itself in the 15L (neon yellow), and with the shell mentioned in my earlier post in the 18L (red)
Only complaints I’ve had about the bags is while building a product line out of recycled fire hose is cool and quite durable, fire hose is heavy, which is why I prefer the smaller bag.
