This innocuous little starfish will keep sliding glass doors from opening too far, especially ones where the door slides on the outside and you can’t use a bar to secure it. The SecureIt can also keep windows from being opened too far, much like a window lock.
If you choose to hang stuff from the SecureIt, the 3-3/8″ suction cup can hold 50 pounds. You can affix the 4″-diameter, 2″-thick SecureIt to any smooth, clean, and dry surface. If you need to remove it, simply pull the tab.
Available in Sky, Sea Mist Green, and Clear, a pack of two SecureIts goes for $20.