67 of the mounting slot 70 contacts the abutment surface 76 of the leg slot the shape of the mounting slot 70 is such that there are four points of contact between each leg 54 and an inserted cross member 56 the contact between the abutment surface 76 of the cross member 64 and the end portions of the leg slots 65 67 is weight bearing the remaining three points of contact between the mounting slot 70 and the body portion 61 of each leg 54 provide stability this configuration as opposed to a linear mounting slot reduces friction between the legs and cross members and simplifies the manufacturing process the cross members are preferably manufactured from a lightweight metal in a preferred embodiment the cross members are 0 25 inch thick aluminum this thickness was chosen to maximize the contact area of each cross member 56 and the lid 14 as will be appreciated thicker materials may be used provided they are sufficiently lightweight and strong the cross members also contain cut away holes 55 to reduce weight as will be readily appreciated the cross members are another important feature of the present invention the cross members act to stabilize the legs and securely support the lid known cases do not include cross members or any ancillary support structure other than the legs themselves the cross members of the present invention help create a support that can be used under the most rigorous of conditions and deployments although the cross members 62 are a critical component of the present invention the legs 54 may be used temporarily without cross.