What is Reddit's opinion of Rothco Gi Style Canvas Double Strap Duffle, Olive Drab?
From 3.5 billion Reddit comments

By popularity on Reddit, this product is:

#1890 in Women's Shops

#11 in Women's Crossbody Handbags

#35 in Travel Duffel Bags

Nakata Shoten is a military surplus store near Ueno station:

And they have duffel bags in the size you want (80 liters+):

Both of these are 88L and look like they have a folding pouch:

...but they look sold-out.

Found some similar ones on Amazon Japan here:

For a cheaper option, there's a lot of milsurp bags like this one that might fit the bill. Seen them used by people for the laundromat as well.

< $50

< $50

< $50