German startup Allpacka lays out the following problem, for those who travel by bike: Sometimes you might spontaneously want to pick up something large, like a crate of beer. But this doesn't happen enough to justify permanently attaching a large cargo box to your bike. Doing so would add hassle to parking your bike, navigating narrow spaces or bringing it onto a train.

Their solution is the Allpacka One, a collapsible cargo box that sits on your bike's luggage rack. Set-up and breakdown takes just one second:

"The Allpacka One is designed to be compatible with all standard luggage racks and bicycle bags," the company writes. "You can secure your load using the various attachment points."

The pop-up crate can handle 20kg (44 lbs). You mount it to your bike's luggage rack using four screws; fasteners were chosen (rather than a quick-release attachment method) as a theft deterrent.

The company says they will launch a crowdfunding campaign for the product later this year.