Imagine an ordinary day
List the devices you carry and the tasks you expect to complete away from home. Include the awkward practical bits: where you can charge, whether you need to transfer a file and whether an unfamiliar screen is involved. Avoid designing the kit around a once-a-year emergency before covering your everyday needs. A small set of familiar, tested items is easier to use under time pressure.
Build one known-working charging combination
Choose the device, charger and cable as a combination and check the manufacturer instructions. Test that combination at home in the way you intend to use it. If you need simultaneous charging, include that in the test and read the multi-port output table. Keep the result documented so a replacement lead does not quietly change the setup. The USB-C guide explains why appearance alone is not a compatibility check.
Measure the pouch and the bag
A product photograph makes every organiser look spacious. Measure your charger and the places where cables bend naturally; do not force them into sharp folds to fit a pocket. Check whether the organiser opens conveniently inside your usual bag. Keep loose small items separate from exposed connectors, and follow the accessory instructions for handling and storage. Leave room for the things you use most often.
Give data a plan of its own
If you carry an external drive, decide what it contains and what happens if it is lost. Do not leave the only copy of important files travelling with the device they came from. Follow your operating-system documentation for protecting sensitive files and connecting external storage. Before a trip, verify that you can find and open the material you need rather than waiting until you are without your normal setup.
Edit the kit after real use
After several outings, note what you used, what you wished you had and what stayed untouched. Remove duplicate items where a verified alternative already does the job. Check cables for damage and keep instructions available. A travel kit does not need to stay frozen forever; it should change with your devices and routine. Buying another organiser is not always the answer to carrying too much.
Check the source
General planning advice. Exact model documentation decides compatibility and setup steps.