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Blood is collected in both fixed and mobile sites. Fixed sites are facilities that are permanently outfitted to serve as a blood donation center. These sites are usually within the blood center or hospital but may be in freestanding locations, such as office buildings or shopping malls. The proportion of blood that is collected in fixed sites is not known and may vary greatly based on different blood centers’ collection strategies. In the Southern parts of the United States, mobile collections operations may predominate based on favorable logistic and climate conditions. A very large portion of the US blood supply is collected in mobile sites. A mobile site is a location that usually serves a purpose other than blood donation. Examples are offices, high schools, social clubs, churches, colleges, manufacturing companies, public buildings, or shopping malls. At the mobile site, or “bloodmobile,” all of the equipment and supplies necessary for blood collection are portable and are brought in for a few hours or days for the blood collection activity, or is a bus specially outfitted for blood donation. Donors at mobile sites are more likely to be first‐time donors, giving under social pressure, and thus with less internal motivation to donate, and they are more likely to experience a reaction or less‐than‐optimal experience [4]. However, the influence that these settings have on the likelihood that an individual will donate or will have a good experience and be willing to donate again is not well understood. There are differences between those who donate at fixed sites and those who donate at mobile locations [4]. Donors at fixed sites report more internal motivation, whereas those at mobile sites report more external motivation. This would be consistent with the structure of mobile sites, which are usually arranged around a blood “drive” of some sort involving a community group or a particular need, thus providing the “external” motivation. At fixed sites, the donor is usually called by blood center staff and the donation scheduled as part of the general ongoing blood collection activity, but there is no relation to a particular community or social group or patient.