Hộp đựng pin AA & AAA

I've made a slim compact travel AA & AAA battery holder, so I never get stuck with a dead wireless keyboard and mouse at the office. You can keep it at your desk, or in your backpack. Neater than let them loose or in the blister.

Made it as one AA and two AAAs, as per the most common wireless keyboard and mouse combos (ie. Logitech, Dell, Microsoft)