A package 2 comprises an outer sleeve 4 and a slider 6 for holding a blister pack slidably mounted within the outer sleeve. The outer sleeve comprises a wall having an outer panel 16 and an inner panel 18. The inner panel 18 has a locking edge 100 formed at a terminal end thereof spaced from and facing a closed end of the sleeve. A locking flap 32 is formed at a terminal end of the slider 6 extending in a direction away from a closed end 8 of the outer sleeve for engagement with the said wall of the outer sleeve. The flap has a free edge 120 for engagement with the locking edge 100 of the inner panel 18 to prevent the slider from being removed from the outer sleeve 4 when the slider 6 is fully received within the outer sleeve 4. The outer panel 16 of the outer sleeve 4 includes a release button 58 at least partially overlapping the flap of the slider 6 when the slider is fully inserted in the outer sleeve, and being pressable so as to disengage the free edge 120 of the slider flap from the locking edge of the outer sleeve wall to permit the slider to be withdrawn from the outer sleeve.
