If you dont want to use your school bag maybe buy a cheap one? Get one of those sling backpacks there small and stretch to fit your paint in there .
I found that taking empty pringles cans and putting cans in them works. Each pringles container can hold one 400mL can of spray pint. So if you get a few pringles cans all you need to do is put the paint in the empty ca s and then put all the "pringles" in a shopping bag, and it lookalike your just coming from the store to a huge party...
whenever im going midday or even just going out at night to get a few tags i just carry the markers in a normal plastic shopping bag, there easy to get and it dosent look suspicious at all. just make sure there not seethrough and if it gets paint on it make sure to get another one. when im going bombing i bought one of these very basic jansport bags http://www.ebags.com/product/jansport/superbreak/1?productid=343&sourceid=adwproduct&couponid=55583734&adtype=pla&gclid=ckrf6svo3a8cfqkfnqodm2cb_a only two pockets but it fits everything i need very good and i dont have to worry about destroying it.
Well Im not sure about some states but if you worried about cops searching you , all you gotta say is " I do not Consent to Searches " and They cant Legally Search you... This works for anything... Yourself, Vehicles , ect.... Unless u have a warrent on you.. but thats self explanitory..
Don't forget if they have probable cause they can hold you until they get a warrant. I have an awesome old laptop backpack with one broken strap I use. Front pocket is all stickers. Middle two pockets is all markers, and the laptop compartment is just wide and tall enough to hold 6 cans.
shopping bags, backpacks, jacket pockets, trackpants pockets, hands all these work at some point in time but yeah defs a shopping bag any aussie on here will know the good ol coles green bags
if you wanna carry a backpack, just get a jansport one, or if not, carry the cans on a normal plastic bag or some fast food bag
1 thing i thought about to carry your things in, is a laptop bag... not those where you can just put in your laptop, no, you need those like has a lot of pockets... you could put in caps, cans, markers, stickers, etc... i just thought of it when some days ago i took my laptop out of my laptop bag and thought, this thing is great to carry graff supplies mines black, it has a big pocket on the back and a little pocket on the front where i can put stickers, then inside, where the laptop goes, i can put cans, and theres also like a net pocket so i can put caps