Hermione's beaded bag

Faced with the threat of Death Eaters descending on them at any moment after Voldemort's return, Hermione Granger made sure that she and her friends were ready for an escape. She enchanted a small beaded handbag with an Undetectable Extension Charm that she made sure to carry everywhere with her. Although the bag looked inconspicuous, it was large enough on the inside that it could carry supplies, clothing and camping gear to keep Harry, Ron and Hermione going whilst hunting Voldemort's Horcruxes. Hermione even used it to bring copious amounts of books with her, as is Hermione's way.