the carry bag 10 shown in fig1 includes a base plate 12 , an airtight bag 14 with a ziplock opening 16 and a suction pump coupling 18 attached to the airtight bag 14 , and a protective outer sleeve 20 with a suction pump 22 attached thereto . air can be evacuated from the bag 14 to compress any contents 24 therein against the base plate 12 in the manner as shown schematically in fig2 by connecting the suction pump 22 to the coupling 18 and operating same . the carry bag 30 shown in fig3 to 5 is used , in a first stage , to receive contents through an outer sealable opening 32 . the opening 32 is then closed to provide an airtight enclosure around the contents , and a hand pump 34 is then operated to evacuate air from the airtight enclosure . flexible walls of the enclosure compress against the contents and hold them tightly in place . the one way valve 36 shown in fig6 ensures that air cannot return into the enclosure during and after the operation of the hand pump 34 . the carry bag 40 shown in fig7 to 10 is similar in structure and function to the carry bags described above , but is adapted specifically for use as a backpack . like features between the carry bags have been assigned like numerals in the drawings . fig1 , in particular , identifies the inner bag 14 evacuated of air and its walls and the contents enclosed therewithin compressed against the rigid support wall 42 . the carry bag 50 shown in fig1 to 13 is adapted specifically for use as a pannier for a motorcycle . again , like features have been assigned like numerals in the drawings . the carry bag 60 shown in fig1 to 18 is used , in a first stage , to receive contents 62 through an outer sealable opening 64 . the opening 64 is then closed to provide an airtight enclosure 66 around the contents , and a hand pump 68 is then operated to evacuate air from the airtight enclosure . flexible walls 69 of the enclosure compress against the contents and hold them tightly in place . the volume of space occupied by the carry bag 60 has thus been significantly reduced and the contents are prevented from movement relative to the bag . the carry bag 70 shown in fig1 and 20 is similar in structure and function to the carry bags described above , but is adapted specifically for use as a backpack . fig2 , in particular , identifies an airtight bag 72 evacuated of air and its walls and the contents enclosed therewithin compressed against a rigid support wall 71 . the backpack 70 includes a stiffened base plate which serves as the support wall 71 , an airtight bag 72 having a flexible wall with a ziplock opening 74 that provides an airtight resealable closure , a one - way air valve 76 mounted to the flexible wall , and a flexible air hose 78 connected at one end to the valve 76 and at the other end to a vacuum pump 80 . air can be evacuated from the bag 72 to compress contents 82 of the bag against the rigid support wall 71 in the manner as shown schematically in fig2 by manually operating the vacuum pump 80 ( according to a reciprocating or pumping motion of the pump ). the outward flow of air from the bag 72 and through the air hose 78 is shown by arrows a , and the inward movement or compression of the flexible wall of the bag against the contents 82 is shown by arrows b . the backpack 70 can thus be worn with the aid of shoulder straps 84 by a user and , as the flexible wall of the airtight bag 72 firmly follows the outermost shape or profile of the contents 82 , the contents will not move relative to the backpack during even violent movement of the user wearing same and the total volume of space occupied by the backpack 70 is significantly reduced . the carry bag 90 shown in fig2 to 23 is similar in structure and function to the carry bags described above , but is adapted specifically for use as a medium sized backpack , also known as a daypack . it has a very light weight structure consisting of an airflow or breathable vest 92 , a cavity 94 for a hydration container , say , for a sports beverage , and dual waterproof independent chambers ( only a single chamber 96 shown ) which are capable of being evacuated of air therewithin by a pump device 98 . the daypack also has foam ribs 97 for back aeration and a waste strap 99 with a foam support . the pump assembly 101 shown in fig2 and 25 may be used in or with any one of the carry bags described above . the pump assembly 101 utilizes two simple one way valves . an inner , smaller valve 102 maintains an airtight seal of the bag when the pump assembly is not in use . to this end , the pump assembly has been designed to close off the inner valve 102 by means of an extension 103 to a top moulding of a valve cap 104 , which clamps down on the inner valve 102 when the pump assembly is shut after use . there is a bayonet style fitting between the top and bottom mouldings . the valves are of a conventional kind found on rubber inflatables and on simple foot pumps used for camping , and have thin rubber sheets that act as a type of diaphragm seal . the concave form of the valves ensures that they remain in a closed state unless forced open by pressure from beneath or within the carry bag it will be readily apparent to persons skilled in the art that various modifications may be made in details of design and construction of the carry bag described above without departing from the scope or ambit of the present invention .
a carry bag has flexible walls defining an enclosure adapted to house contents of the bag . the enclosure has an opening for receiving the contents therethrough , the opening being sealable for airtightness of the enclosure . there are also means , including a pump , for evacuating air from the enclosure so as to compress the walls against the contents to thereby restrain the contents from movement .