ProPassione makes this cigarette stainless steel flask, complete with a hidden stash compartments for cigarettes or cash.

This custom swing-out secret bookcase door, along with a brief description and additional pictures, was posted in the comments of a related Instructables article. It was built to fill the space where a wet bar once stood, and to conceal ...

This Danish company makes drawers that fit into stairs. Without a translator, I'm not sure if they are a kit or custom installs, but either way it's a solution to a common storage problem; what do you do with that ...

This Lockdown watch previously made by Freestyle included a secure inner compartment for small items of value.

Here's a clever trap door in the floor of a stair landing. I don't know it's particular use, but possibly for storage or storm shelter access.

This custom kids room setup includes several under floor storage compartments concealed by trap doors. These could be incorporated into many locations, and covered up with rugs.

ConcealedCabinet offers these bathroom cabinets hidden behind picture frame doors.

The Bed Bunker is a secret safe that fits under your mattress to make use of wasted space, and securely store guns and valuables. You'd have to push your significant other off the bed to get to a firearm stored ...

This wall safe is concealed behind a fold-down coat rack and secured with a lock and key.

Reef's Stash 2 Sandals have hidden compartments in the heel, great for storing keys and cash when traveling light at the beach or pool.