Just tell your parents.
btw --- NEVER leave rice where it can get wet if it will be there for a while NEVER!
Only old soggy rice and dryads saddle have made me feel ill like that. Old soggy rice is a defensive weapon. Eating the dryads saddle, mearly being close to the old soggy rice.
Worse case scenario if you tell them you will be disowned and get a chance to prep to your hearts content.
usually a garbage bag is a pretty good seal, but what exactly is in the bags you want to leave?
Just be mindful if someone else is buying the old property they could find it and discard of or take the bags.
it all depends what you want to store.. rain damage etc.. bagging inside and sealing, and bagging outside the bag should protect it well but perishables, perish.
Any produced foods, like chocolate bars chips, cans of pop should last a few years atleast. Things like bread will mold, most "real type foods" will mold. There are ways to prep.
In a double baged garbage system described above should protect most materials the more plastic layers the better.
You want to keep any electronics deep underground, atleast 10 feet, or in a farraday cage, which can be made out of an old microwave, but bear in mind capacitors are dangerous and don't attempt to gut a microwave until you know how to do so safely.
other than this .. stuff like plastic bags and tupper wear will keep most processed goods for a long time, however bera in mind a spider hole without proper drainage turns into a well or large puddle once erosion has its way.
burrying it may be a better option than putting it in a spider hole. but it may end up that way anyway. Just know that going into earthen holes without proper frame support can be dangerous and lethal. Same as building a deep snow fort. Soil type can have a major influence if you are completely covered it can be lethal, so plan anything like that with safety in mind, this includes insuring you can be unburried within a few seconds.
Spider holes without frame support become hazards, pitfalls, etc..
good plan though. Just be mindful of someone else who owns your property after you move.
using a "neutral" public forest area etc.. nearby may be a better option because hidden public areas rarely get explored by anyone but kids. But property owners may survey their property. You have a much better chance of hiding or bugging out about 20-50 meters from any major trail or further, than on private land where someone lives, unless it is underneath their property. People never suspect tunnels under their property, or also on their rooves, in the upper part of a house without an attic etc.. out of sight out of mind.
My geuss is you should be able to conceal anything in your bag by putting inside other things like clothes, books, etc.. concealment of stuff is pretty easy, especially if there is room to hollow something out.
Smuggling is a useful prepping skill.
Personally I think the healthiest type of relationship with family is just being honest, atleast they will hate you for who you are if they don't agree with your choices. Parents who hate their kids for what they do suck anyway, so it will speed things up. If you arn't breaking the law, your parents really shoulnd't care unless they are quakers or something. I know you arn't old order because you have internet.
