A deep finger notch can still be awkward if the thumb slides off the lid before the catch releases. An opening trial should show where the user gets purchase, how the latch releases, and what happens immediately after release.
Observe the first movement
Use fully assembled compacts with the intended surface finish. Check the notch from the front and sides for usable width, depth, edge shape, and an exposed lip that a thumb or finger can reach. Ask several people to open each sample the same way, then repeat in the intended one-hand or two-hand use. Keep track of which hand, contact point, and posture were used. Watch for slipping, a need to dig in with a nail, or a second attempt.
Compare the access observation with a separate measurement of release force. Use the same force direction and point on each sample, since changing either can change the leverage on the latch. Record any cases where a comfortable notch still feels difficult because the catch is stiff. Also watch how far the lid moves once the latch clears and whether it can be opened without the user changing grip.
Run the comparison on decorated parts. A different edge radius or finish in the final sample can change how the thumb engages even when the notch outline looks similar. If a design feels harder to open, the notes should identify whether to revise the finger contact area, examine the latch, or investigate the hinge movement. Keep the physical sample with the record so the comparison can be repeated after a design change. The SamBound packaging catalog is available at sambound.com.
sambound.com
SamBound New Material Technology Company Ltd.
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