Should I get a single structured bag or a multipack of pouches?

It depends on how many pairs you pack. r/onebag commenters generally favor one or two structured bags (Eagle Creek or Thule style) that compress bulky sneakers and keep their shape inside a carry-on. Travelers packing dance shoes, sandals, or kids' shoes lean toward multipacks like YAMIU or vivinin, where the cost per pouch is low and you can dedicate one bag per pair. The two categories aren't really competing.