Described is a collapsible fluid reservoir that may be expanded during use and collapsible to lie substantially flat when not in use. According to one embodiment, a collapsible fluid reservoir can include a substantially non-rigid container having a substantially open proximal end and a substantially sealed distal end opposite the proximal end defining a cavity therein, wherein the distal end includes at least one fluid outlet port extending therethrough. The collapsible fluid reservoir can also include a substantially rigid cap affixed to the proximal end of the non-rigid container and including at least one fluid inlet port extending therethrough and in fluid communication with the cavity.
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