Abstract: A stacking system 1 has eleven pairs of right and left uprights (11, 12). They are supported upright by crosspieces (14, 15, 16), there being two straight crosspieces (14) and two cranked crosspieces (15, 16). The straight crosspieces have three pairs of uprights, whilst the crosspiece (15) has two pairs and the crosspiece 16 has three pairs. This particular arrangement allows five differing lengths of tubes T1-T5 of successively longer length to be stacked. The length of the tubes is parallel to an axis L. The uprights are square section tubular steel with slots (18) in their faces facing each other in their pairs. The slots extend from close above their lower ends to a little short of their upper ends, which are bevelled inwards (19) in the pairs.