looks more like a bug out bag. think outside the box here
what usually follows with earthquakes? what is most likely
1. power outages
2. riots
3. WW3
now with that answer, think of the 3 basic ameneties to survive in that situation, what do you think they are?
1. rocket launcher
2. jugs of water food and clothing
3. pencil
i hate to sound like a written exam here, but you need to focus on essentials first.
start with stocking up on some water, 1 weeks worth for 1 person is great. then food, you should buy freeze dried non-heat dependent foods that need little to NO preparation. canned foods are good too. just remember, preparation takes time and energy. that is extremely valuable in an emergency where energy is not abundant. so stay simple, keep some MRE's.
next, focus on clothing. cheap clothes will do; you do not need the latest poartec or thinsulate long johns to get you through a california disaster. cheap cotton shirts from the T shirt warehouse work good with some cheap jeans. or sweats. anything that will allow you to layer and shed easily without wasting too much energy or time.
now that you have food water and clothes covered, focus on the other stuff.
crank powered flashlight and radio and/or battery powered flashlight with at least 2 spare pairs of batteries
book of strike anywhere, waterproof-weatherproof matches.
crank powered radio-VERY important.
firearm with some ammo-the ammo should be sealed in at least a zip lock bag to prevent oxidation.
roll of toilet paper or tissue
first aid kit, for obvious reasons
last but not least, shelter. which you can really make anywhere, with a set of tree branches and some leaves; but its nicer to have a spare tent and sleeping bag. at least it wont collapse on you during the aftershocks