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An inflatable bag comprises a small sack which is charged with sodium bicarbonate and accommodating a small externally breakable container filled with an acidic solution. The small sack is enveloped in an inflatable bag member which is made of a synthetic resin having no permeability to the gas whic

An inflatable bag comprises a small sack which is charged with sodium bicarbonate and accommodating a small externally breakable container filled with an acidic solution. The small sack is enveloped in an inflatable bag member which is made of a synthetic resin having no permeability to the gas which is generated as a reaction between the sodium bicarbonate and the acidic solution. As the small container is collapsed by external pressure, the acidic solution flows out of the container into reaction with the sodium bicarbonate, thereby generating carbon dioxide gas. The small sack is punctured by the gas pressure with a sound of a bang or a whistle and, thereafter, the inflatable gas member is gradually inflated. It is possible to use a plurality of small sacks made of a material which exhibits small extension, such that one small sack is contained in another sack. With this arrangement, the "bang" can be generated repeatedly or the whistles blown successively by the same number as the number of the small sacks used.

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1. An inflatable bag, comprising: a quantity of a first substance which when mixed with a quantity of a selected second substance will generate a quantity of inflating gas; a quantity of a selected second substance which when mixed with said quantity of said first substance will generate said qu

1. An inflatable bag, comprising: a quantity of a first substance which when mixed with a quantity of a selected second substance will generate a quantity of inflating gas; a quantity of a selected second substance which when mixed with said quantity of said first substance will generate said quantity of inflating gas; an inner container being constituted by first wall means having an internal volume containing both said quantity of said first substance and said quantity of said selected second substance together with a breakable second wall means, which, while it remains unbroken, maintains said quantity of said first substance separated from said quantity of said selected second substance; and an outer container containing said inner container and being constituted by flexible third wall means defining a bag capable of having, when inflated, a substantially larger internal volume than said internal volume of said inner container; said internal volume of said inner container being insufficient to contain all of said quantity of inflating gas and said first wall means of said inner container being constructed and arranged to permit said inflating gas to escape from said inner container into said internal volume of said outer container only after said breakable second wall means has been broken and said quantity of said first substance and said quantity of said selected second substance have substantially fully contacted one another within said inner container while said inner container has remained substantially intact but for breakage of said breakable second wall means; said first and third wall means of said inner and outer containers being constructed and arranged to permit said breakable second wall means to be manually broken from externally of said outer container without rupturing said outer container and without rupturing said inner container and said first wall means of said inner container being relatively non-stretchable, so that as said quantity of inflating gas is generated in said inner container upon breakage of said breakable second wall means, at least some of said inflating gas, sufficient to inflate said internal volume of said outer container, must escape through said first wall means of said inner container into said internal volume of said outer container; and said internal volume of said outer container being sufficient to contain all of said quantity of inflating gas so as to dispose said outer container in an inflated condition; one of said first substance and selected second substance being in powder form, and the other of said first substance and selected second substance being in liquid form; said first substance being a mixture of sodium bicarbonate and an acidic agent and said second selected substance being water; a first intermediate container being constituted by fourth wall means having an internal volume containing said inner container and being contained within said internal volume of said outer container; said internal volume of said first intermediate container being insufficient to contain all of said inflating gas which escapes through said first wall means of said inner container upon contacting of said quantity of said first substance and said quantity of said selected second substance; said fourth wall means of said first intermediate container being constructed and arranged to permit said inflating gas to escape from said first intermediate container into said internal volume of said outer container only after said inflating gas has escaped from said inner container into said first intermediate container and fully inflated said internal volume of said first intermediate container; and said fourth wall means of said first intermediate container being relatively non-stretchable, so that after said inflating gas begins to escape from said inner container into said first intermediate container so as to inflate said internal volume of said first intermediate container, at least some of said inflating gas must escape through said fourth wall means of said first intermediate container into said internal volume of said outer container; and said first and fourth wall means of said inner container and of said first intermediate container are constructed and arranged to successively suddenly rupture with an audible `bang` for permitting escape of said inflating gas through the respective said first and fourth wall means. 2. The inflatable bag of claim 1, wherein: said third wall means of said outer container is made of a synthetic resin which is substantially impermeable to carbon dioxide gas. 3. The inflatable bag of claim 2, wherein: said synthetic resin is polyvinylidine chloride. 4. The inflatable bag of claim 1, wherein: said third wall means of said outer container is made of a synthetic resin which is substantially impermeable to carbon dioxide gas. 5. The inflatable bag of claim 4, wherein: said synethetic resin is polyvinylidine chloride. 6. An inflatable bag, comprising: a quantity of a first substance which when mixed with a quantity of a selected second substance will generate a quantity of inflating gas; a quantity of a selected second substance which when mixed with said quantity of said first substance will generate said quantity of inflating gas; an inner container being constituted by first wall means having an internal volume containing both said quantity of said first substance and said quantity of said selected second substance together with a breakable second wall means, which, while it remains unbroken, maintains said quantity of said first substance separated from said quantity of said selected second substance; and an outer container containing said inner container and being constituted by flexible third wall means defining a bag capable of having, when inflated, a substantially larger internal volume than said internal volume of said inner container; said internal volume of said inner container being insufficient to contain all of said quantity of inflating gas and said first wall means of said inner container being constructed and arranged to permit said inflating gas to escape from said inner container into said internal volume of said outer container only after said breakable second wall means has been broken and said quantity of said first substance and said quantity of said selected second substance have substantially fully contacted one another within said inner container while said inner container has remained substantially intact but for breakage of said breakable second wall means; said first and third wall means of said inner and outer containers being constructed and arranged to permit said breakable second wall means to be manually broken from externally of said outer container without rupturing said outer container and without rupturing said inner container and said first wall means of said inner container being relatively non-stretchable, so that as said quantity of inflating gas is generated in said inner container upon breakage of said breakable second wall means, at least some of said inflating gas, sufficient to inflate said internal volume of said outer container, must escape through said first wall means of said inner container into said internal volume of said outer container; and said internal volume of said outer container being sufficient to contain all of said quantity of inflating gas so as to dispose said outer container in an inflated condition; one of said first substance and selected second substance being in powder form, and the other of said first substance and selected second substance being in liquid form; said first substance being sodium bicarbonate and said second selected substance being an acidic solution; a first intermediate container being constituted by fourth wall means having an internal volume containing said inner container and being contained within said internal volume of said outer container; said internal volume of said first intermediate container being insufficient to contain all of said inflating gas which escapes through said first wall means of said inner container upon contacting of said quantity of said first substance and said quantity of said selected second substance; said fourth wall means of said first intermediate container being constructed and arranged to permit said inflating gas to escape from said first intermediate container into said internal volume of said outer container only after said inflating gas has escaped from said inner container into said first intermediate container and fully inflated said internal volume of said first intermediate container; and said fourth wall means of said first intermediate container being relatively non-stretchable, so that after said inflating gas begins to escape from said inner container into said first intermediate container so as to inflate said internal volume of said first intermediate container, at least some of said inflating gas must escape through said fourth wall means of said first intermediate container into said internal volume of said outer container; and said first and fourth wall means of said inner container and of said first intermediate container are constructed and arranged to successively suddenly rupture with an audible `bang` for permitting escape of said inflating gas through the respective said first and fourth wall means. 7. The inflatable bag of claim 6, wherein: said third wall means of said outer container is made of a synthetic resin which is substantially impermeable to carbon dioxide gas. 8. The inflatable bag of claim 7, wherein: said synthetic resin is polyvinylidine chloride. 9. The inflatable bag of claim 6, wherein: said third wall means of said outer container is made of a synthetic resin which is substantially impermeable to carbon dioxide gas. 10. The inflatable bag of claim 9, wherein: said synthetic resin is polyvinylidine chloride. 11. An inflatable bag, comprising: a quantity of a first substance which when mixed with a quantity of a selected second substance will generate a quantity of inflating gas; a quantity of a selected second substance which when mixed with said quantity of said first substance will generate said quantity of inflating gas; an inner container being constituted by first wall means having an internal volume containing both said quantity of said first substance and said quantity of said selected second substance together with a breakable second wall means, which, while it remains unbroken, maintains said quantity of said first substance separated from said quantity of said selected second substance; and an outer container containing said inner container and being constituted by flexible third wall means defining a bag capable of having, when inflated, a substantially larger internal volume than said internal volume of said inner container; said internal volume of said inner container being insufficient to contain all of said quantity of inflating gas and said first wall means of said inner container being constructed and arranged to permit said inflating gas to escape from said inner container into said internal volume of said outer container only after said breakable second wall means has been broken and said quantity of said first substance and said quantity of said selected second substance have substantially fully contacted one another within said inner container while said inner container has remained substantially intact but for breakage of said breakable second wall means; said first and third wall means of said inner and outer containers being constructed and arranged to permit said breakable second wall means to be manually broken from externally of said outer container without rupturing said outer container and without rupturing said inner container and said first wall means of said inner container being relatively non-stretchable, so that as said quantity of inflating gas is generated in said inner container upon breakage of said breakable second wall means, at least some of said inflating gas, sufficient to inflate said internal volume of said outer container, must escape through said first wall means of said inner container into said internal volume of said outer container; and said internal volume of said outer container being sufficient to contain all of said quantity of inflating gas so as to dispose said outer container in an inflated condition; a first intermediate container being constituted by fourth wall means having an internal volume containing said inner container and being contained within said internal volume of said outer container; said internal volume of said first intermediate container being insufficient to contain all of said inflating gas which escapes through said first wall means of said inner container upon contacting of said quantity of said first substance and said quantity of said selected second substance; said fourth wall means of said first intermediate container being constructed and arranged to permit said inflating gas to escape from said first intermediate container into said internal volume of said outer container only after said inflating gas has escaped from said inner container into said first intermediate container and fully inflated said internal volume of said first intermediate container; and said fourth wall means of said first intermediate container being relatively non-stretchable, so that after said inflating gas begins to escape from said inner container into said first intermediate container so as to inflate said internal volume of said first intermediate container, at least some of said inflating gas must escape through said fourth wall means of said first intermediate container into said internal volume of said outer container. 12. The inflatable bag of claim 1, wherein: each of said first and fourth wall means of said inner container and said first intermediate container is provided with whistle means constructed and arranged to audibly emit a whistling sound as inflating gas escapes therethrough respectively from said inner container into said first intermediate container and from said first intermediate container into said outer container. 13. The inflatable bag of claim 11, wherein: one of said first substance and selected second substance is in powder form, and the other of said first substance and selected second substance is in liquid form. 14. The inflatable bag of claim 13, wherein: said first and fourth wall means of said inner container and of said first intermediate container are constructed and arranged to successively suddently rupture with an audible `bang` for permitting escape of said inflating gas through the respective said first and fourth wall means. 15. The inflatable bag of claim 11, wherein: said first and fourth wall means of said inner container and of said first intermediate container are constructed and arranged to successively suddently rupture with an audible `bang` for permitting escape of said inflating gas through the respective said first and fourth wall means