formed from similar mesh material with a pair of internal side located sewn on straps 272 274 around a perimeter edge of the top flap 270 can be a sewn on strap edge 276 one side edge of the top flap 270 can be sewn directly to an upper side edge of the rectangular outer layer 250 to form a hinge portion for the top flap 270 along an upper edge of the rectangular outer layer 250 can be a sewn on strap edge 252 with a zippered portion that can be fastened by a zipper 275 to a similar zippered portion to allow the top flap 270 to function as a lid that can be opened and closed to access the interior of the bag 200 inside the rectangular outer layer 250 can be four identical compartments 210 220 230 240 for safely holding and separating cylinder tanks of various sizes from one another a compartment 210 is shown having a tubular container formed from a mesh material 215 similar to those previously described and a sewn on top pliable and flexible strap material edge 212 and a side sewn on strap edge 214 that is directed toward a middle portion of the bag 200 so that all four side edges face one another tank cylinders 212 222 232 242 can be easily slipped into the open tops of each tubular container 210 220 230 240 can be supported by bottom flap 260 top flap 260 can be fastened into a closed position on the bag 200 allowing the bag to positioned in a vertical upright position.