If you don't have a garage, shed or enough room in your home, it's certainly possible to lock your bike up outside … although that leaves it open to the weather, vandalism, and parts-thieves. That's why the Alpen Bike Capsule was created. It's designed to keep your steed enclosed and secure while stored outdoors.
Made out of UV-resistant roto-molded polyethylene, the waterproof capsule has a ball bearing-equipped hinged "lid" that is simply pulled forward over the bike inside, then locked via an integrated key lock. To keep the whole capsule from being stolen, it can be bolted down from the inside, to surfaces such as concrete pads or wooden decks.
It can reportedly accommodate almost any type of bicycle, along with some gear. Bikes with handlebars a bit wider than 558 mm (23 inches) will need to have their front wheel turned at an angle in order to fit in, while ones with particularly wide bars will need to have their front wheel removed so that the bars/fork can be turned completely sideways.
The unit weighs about 130 lb (59 kg), and measures 79 inches long (2,017 mm) by 53 inches high (1,334 mm) by 32 inches wide (813 mm).
If you're interested in getting one, it can be preordered now for US$899, plus $200 shipping within the US. Delivery is estimated for September.
Source: Alpen Storage via BikeRadar
But as an extra layer of protection they could work.