For a personal time capsule, 10 to 30 years may be enough, whereas a generational time capsule meant for your grandchildren may need to last 60 to 70 years. If you want your capsule to be opened at an even later date, you will want to start planning the logistics. It's okay to not have a specific date for the capsule to be opened. Maybe you want to open it when you are married or reach retirement. If your capsule is only supposed to last 5 to 10 years, a simple, everyday container will keep the contents safely tucked away and easily portable, without the risk of outdoor stowing. Keep in mind that a capsule made of cardboard or paper may be completely destroyed by fire, flood, or other natural disaster. If you have a used coffee tin around, the aluminum will hold up below ground for around 10 years. To avoid getting water past the lid, bury the container inside a Ziploc bag, or other airtight plastic wrapping. If you plan to place the time capsule outdoors or bury the time capsule, select a container that is likely to survive, like a commercial or home-built aluminum, stainless steel, or PVC plastic capsule.  One example of a sturdy home-built PVC container is a PVC tube with an end cap attached with PVC cement and a test cap lid that can be screwed tightly into the pipe.  Consider using desiccant "gel bags", such as those included in the packaging of electronic goods and in bottles of vitamin tablets. These help to absorb any moisture that may have been present at the time of encapsulation and help to kill microbes that may make some of your items perish.
حدد الزمن الذي ستترك فيه الكبسولة. استعمل صندوقًا للأحذية أو صفيحة معدنية أو حقيبة سفر قديمة للكبسولات قصيرة الأجل التي ستتركها في مكانٍ مغلق. استعمل علبة القهوة المعدنية ككبسولة زمنية قصيرة الأجل. اختر وعاءً مقاومًا للعوامل الجوية للتخزين لفترة أطول.