Polymer bags are mostly used for the collection of odorous compounds. In particular, sampling bags of materials such as TedlarTM or NalophanTM are considered appropriate [37,38,53]. Several researchers have investigated the features of plastic bags in order to verify the existence of background emissions. Keener et al. [54] and Trabue et al. [55] have shown that TedlarTM bags emit acetic acid and phenol, which might bias air samples collected for olfactory analysis. Moreover, they have demonstrated that recovery of malodorous compounds is dependent on the residence time in the TedlarTM , bag with longer residence times leading to lower recovery. Reported background values in commercially available bags without pre-cleaning are in the range of 20–60 ou/m3 in TedlarTM [56], 30–100 ou/m3 in NalophanTM [57] or 2–30 ou/m3 and 10–50 ou/m3 in TedlarTM and NalophanTM, respectively [58]. In these studies the authors have reported that flushing the bags with non-odorous air and, in some cases coupled by heating, background levels are reduced to about 10 ou/m3.