I have a messenger bag (backpack) that I used in the past just because I didn't have anything else and improvised. Now I just keep the toys I usually don't use in there. I keep a mini masterlock through the zipper loops. I also have a "storage" box under my bed that I fixed up so that I could lock it. After that, I ran out of room and had to take most of my things to my boyfriend's house. He keeps them in his bedside drawers, unlocked.
One time we left a single cuff (link
) on his bedroom floor. The next day his mom decided she would do this laundry (which she never does). She went into his room, saw the cuff and asked him what it was. Thankfully, my boyfriend thinks quickly on his feet and told her it was for an exercise (he's a personal trainer); that you attached it to your ankle and attached it to weights. She bought it. I was laughing so hard when he told me about it but I am so glad I was not there or I would have turned bright red over it.