Packing Lists, Worked in Litres
Packing lists built in litres rather than item counts, because bulk is what fills a bag and a count of shirts tells you almost nothing about whether it closes.
Why litres rather than items
Two five-day lists with identical item counts can differ by twenty litres, because a fleece is six litres and a t-shirt is one. Every list here is costed in approximate litres so it can be adapted rather than followed.
The figures come from the capacity arithmetic in how many litres do you need.
What Fits in an 18 x 14 x 8 Inch Personal Item →
An 18 by 14 by 8 inch bag is about 33 litres of paper volume and rather less in practice. A worked packing list for four days, and where compression changes it.
Five-Day Carry-On Packing List, Worked in Litres →
A five-day list built in litres rather than items, for a 40-litre bag, with the winter version alongside the summer one and where compression is applied.
How to Fit a Winter Coat in a Carry-On Backpack →
A packed winter coat is eight to twelve litres, a quarter of a 40-litre bag. The three ways to deal with it, and which one compression actually replaces.