Vivapore® solvent absorption concentrators are disposable ultrafilters for macromolecule concentration from up to 10 mL aqueous samples.  They are an economic and user-friendly alternative to centrifugal concentrators since they do not require any additional equipment. Solvent absorption is a gentle, low-pressure process that is ideal for concentrating shear-sensitive molecules, while the compact units can easily be placed into a refrigerator or cold room for temperature-sensitive samples. Each pack of Vivapore® 10 includes one stand to hold up to four units during use and the sample capacity can be increased to 20 mL with optional reservoirs.