Sass media query break-point mixins

_breakpoints.scss

@mixin bplowerthan($point){
	@media all and (max-width: $point){
		@content;
	}
}
@mixin bphigherthan($point){
	@media all and (min-width: $point){
		@content;
	}
}
@mixin bprange($point-from, $point-to){
	@media all and (min-width: $point-from) and (max-width: $point-to){
		@content;
	}
}
@mixin tinyport{
	@media screen and (max-width: 320px) and (orientation:portrait){
		@content;
	}
}

//example
.example{
  max-height: 50px;
    @include bplowerthan(940px){
      max-height: 35px;
    }
}