I sent my fiance on a fishing excursion, and he came home with about 30 lbs of fish - this vacuum sealer saved the day, we quickly processed the fillets and froze them in perfectly portioned bags.  I plan to use this device to portion out the bulk food purchases as well.  The manual sealer works with the vacuum bags, which i find useful for dry goods especially and I reuse them.  The bag rolls are marked with lines so it is easy to get it lined up.  Very well thought out design, instructions are printed on the inside bag loading area for quick reference.  Very happy with this sealer, five stars!