My current packing light challenge is winnowing down my non-clothing items. I recently used a different ~ 20L carry-on bag with flatter pockets and realized how much my "etc" category really weighed as I corralled contents into various pouches. I have portions of Office Depot, Sephora, and the Container Store all in there (or a lot of Muji + tech gadget gear). I think I'll start working on shape uniformity so things fit together better like toiletries in the same bottle shape and avoiding candy bar shapes when packing mostly flat items.