No weight limits for carry-on bags are noted in United's carry-on bag policies. Carry-on bags and personal items within the size limits can fly regardless of weight as long as the carry-on can fit ...

or a sturdy backpack Though we don’t recommend any backpacks as a personal item in our guide, we tried the Patagonia Refugio Daypack 26L, our favorite backpack for students. It turns out that ...