to receive lids of various sizes it is self shape retaining so as to tend to return to its original undistorted shape when no lid is inside it this is an optional feature it is shown as a rather rectangular structure it could instead by a continuous curved arc another optional feature is best shown in fig3 and 4 the inner sidewall 31 has portions 45 46 of different diameter portion 45 being larger this forms a shoulder 47 between them the purpose of this shoulder is to stop the rim 23 before lower edge 48 of the body can strike shoulder 16 of the jar this prevents the body from pushing down on the shoulder which would cause a drag that resists the turning of the lid shoulder 47 would not be provided if only lids without a seal were to be removed also it is not necessary even when beaded lids are used it is however a convenience when lids with beads are to be removed from a jar a stop 50 may optionally be formed on the inside top of the body it forms an ultimate stop for a lid especially useful when an abutment 47 or a shoulder 16 is not involved stop 50 may include a central reinforcement area 51 this will stiffen the body somewhat and is also available for identification and advertising material fig5 illustrates the simplest embodiment of the invention it includes only body 20 and not abutment 40 all of the shapes described above can be utilized in the same manner another useful embodiment of the invention not shown comprises the construction of.