porosities also if desired the changes in parameters of the bodies 11 and end members 14 may require changes in the vibratory welding parameters the granular material 23 which was actually used in the canisters 10 is known as crosfield white silica gel having a particle size of about 0 5 1 millimeter and the canisters 10 containing such silica gel are intended for use in adsorbing moisture in various environments such as pharmaceutical containers food containers and in any other environments where moisture adsorption is desired it will be appreciated however that any other type of granular or nongranular gas treating material can be used including by way of example and not of limitation such materials as activated charcoal molecular sieve activated bentonite montmorillonite calcium sulfate clintolite and crystalline metal aluminosilicates the canisters can also contain any other suitable product including but not limited to conventional oxygen absorbing compositions and conventional carbon dioxide absorbing compositions the foregoing products absorb or adsorb gases from the environments in which the canisters are placed however the canisters can also contain products which produce vapors which pass into the environment in which the canisters are located and such vapors by way of example and not of limitation are fragrances and carbon dioxide.