I'm going to buy a dildo and I'll need your help (not your money)

I'm currently on holiday near a relatively large city compared to my home town. I thought "I wonder if there are many sex shops here," and what do you know; there are a few. So I want to go to one and buy a dildo, one that bends a bit would be lovely, one with a suction cup would be lovelier, one that vibrates and stuff would be perfect.

But I don't need your help choosing one; I can pick one myself thank you very much (unless you know something special that's affordable, no I won't get an aneros or a buttplug (yet?)). No, I need your advice on how to deal with one minor (it's not minor) problem: I'm here with my parents. Other than that, I'm all good. We're staying in a house and I sleep in my own room, I can tell them I'll explore the city on my own, I'm good on money and I have a small backpack I could potentially hide it in for the ride home, though they don't stop themselves from looking inside of that one (it's mine, but not private, so to speak). Oh, and I want to buy some lingerie there, probably a thong or g-string as I don't have either yet, but I can just wear those to hide them. Really, I only need a plan.

So recap with bullet-points

(+)

• I'm in a city with sex shops

• They sell toys and lingerie there

• I have enough money for non-expensive toys and lingerie

• I have a backpack I could hide it in

• I can go to the shop on my own

(-)

• I'm here with my parents

• My parents could look in my backpack

• I have no other plan

So if you have experience with a similar situation, please help. If you have an original plan that could work, please help. If you have experience with something like this going wrong, please help by telling me what I shouldn't do, so I can prevent the wrong. Also, if you have ideas for cheap but nice clothes available at sex shops, please help.