Google "scuba box" 44ltr and 50ltr are ideal.... the 44ltr version holds 6 full reels of filament and a dozen "samples" of 5 or 10mtrthe boxes are watertight and airtight as well as being black to stop UV degradationI use the 44ltr size with 500grams (a pound weight) coloured silica gel (google) which changes colour when it gets damp... then dry it for a few minutes in a microwave.should be easy for you.... I'm in the uk and had to find an importer for the scuba box... thanks solent plastics (for anyone in the uk or eu.malcolm