a child - protected thermoplastic container having a generally square shape including a closure having horizontal sealing surfaces complimentary to sealing surfaces on the top of parallel container sides , and including tapered guide surfaces on the parallel sides to guide the closure from back to front for closing while forcing a tight seal on the sealing surfaces . the front of the closure is provided with a handle which snaps closed to effectuate a tight seal on the front , which must be opened before the closure will slide back to open the container .