Snowbird - ULB usually means the Ultralight Backpacker model from Hennessy. Also often seen as BULA (Backpacker Ultralight Asym) or ULBA (Ultralight Backpacker Asym). The difference comes from different ways Hennessy has marketed it in the past, and just from people calling it whatever they feel like at the time.
Hennessy used to make a non-asym model but they don't anymore.
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