What size electronics organizer do I need for travel?

For a phone charger, a couple of cables, earbuds, and a small power bank, a compact pouch around 7-8 inches long is enough. If you carry a laptop charging brick, multiple power banks, a portable SSD, or camera accessories, look at the 10-inch class instead. Reviewers consistently warn that buying too large invites overpacking and adds bulk you'll resent in a personal-item bag.