Ishida was sure that one could not simply walk into Hueco Mundo, one had to be prepared. So he sat down, wrote a list and started packing.
Five pairs of socks – it was a must, Hueco Mundo might be wet or cold, keeping warm feet was a prerequisite to healthy condition. A pair of spare glasses – an absolute must, he would be useless in battle if he could not see. A spare cape – the Quincy code of honour meant doing battle in proper uniform. The sewing kit – in case the spare cape also got damaged, and for various other wardrobe malfunctions. Cereal bars and energy drinks – no handy convenience stores would exist in Hueco Mundo, and they would need food. The medical kit – in case someone got hurt while looking for Inoue-san, and that hot-headed idiot Kurosaki would definitely get hurt. Blankets – Ishida was quite sure Hueco Mundo nights would be cold, and they would need to get some sleep. Some toilet paper – obviously, when nature called, one had to answer, and having no toilet paper around would be inconvenient. Disinfectant wipes – Hueco Mundo was bound to be full of germs.
A few other odds and ends, and Ishida was sure that he would be prepared for any eventuality. However, he was not prepared to find out he couldn't even move the bag after all indispensable items had been stuffed in it...